ALPHA METALLURGICAL RESOURCES, INC., 10-K filed on 3/15/2021
Annual Report
v3.20.4
Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Feb. 28, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-38735    
Entity Registrant Name ALPHA METALLURGICAL RESOURCES, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 81-3015061    
Entity Address, Address Line One 340 Martin Luther King Jr. Blvd.    
Entity Address, City or Town Bristol    
Entity Address, State or Province TN    
Entity Address, Postal Zip Code 37620    
City Area Code 423    
Local Phone Number 573-0300    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol AMR    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 56
Entity Common Stock, Shares Outstanding   18,389,139  
Documents Incorporated by Reference Part III incorporates certain information by reference from the registrant’s definitive proxy statement for the 2021 annual meeting of stockholders (the “Proxy Statement”), which will be filed no later than 120 days after the close of the registrant’s fiscal year ended December 31, 2020.    
Entity Central Index Key 0001704715    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
v3.20.4
Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenues:    
Coal revenues $ 1,413,124 $ 1,995,934
Other revenues 3,063 5,346
Total revenues 1,416,187 2,001,280
Costs and expenses:    
Cost of coal sales (exclusive of items shown separately below) 1,281,011 1,667,768
Depreciation, depletion and amortization 139,885 215,757
Accretion on asset retirement obligations 26,504 23,865
Amortization of acquired intangibles, net 9,214 (3,189)
Selling, general and administrative expenses (exclusive of depreciation, depletion and amortization shown separately above) 57,356 78,953
Merger-related costs 0 1,090
Asset impairment and restructuring 83,878 66,324
Goodwill impairment 0 124,353
Total other operating income:    
Mark-to-market adjustment for acquisition-related obligations (8,750) (3,564)
Other income (2,223) (974)
Total costs and expenses 1,586,875 2,170,383
Loss from operations (170,688) (169,103)
Other (expense) income:    
Interest expense (74,528) (67,521)
Interest income 7,027 7,247
Loss on modification and extinguishment of debt 0 (26,459)
Equity loss in affiliates (3,473) (6,874)
Miscellaneous loss, net (1,972) (10,195)
Total other expense, net (72,946) (103,802)
Loss from continuing operations before income taxes (243,634) (272,905)
Income tax benefit 2,164 53,287
Net loss from continuing operations (241,470) (219,618)
Discontinued operations:    
Loss from discontinued operations before income taxes (205,429) (105,185)
Income tax benefit from discontinued operations 0 8,484
Loss from discontinued operations (205,429) (96,701)
Net loss $ (446,899) $ (316,319)
Basic loss per common share:    
Loss from continuing operations (in dollars per share) $ (13.20) $ (11.68)
Loss from discontinued operations (in dollars per share) (11.22) (5.14)
Net loss (in dollars per share) (24.42) (16.82)
Diluted loss per common share:    
Loss from continuing operations (in dollars per share) (13.20) (11.68)
Loss from discontinuing operations (in dollars per share) (11.22) (5.14)
Net los (in dollars per share) $ (24.42) $ (16.82)
Weighted average shares - basic (in shares) 18,298,362 18,808,460
Weighted average shares - diluted (in shares) 18,298,362 18,808,460
v3.20.4
Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement of Other Comprehensive Income [Abstract]    
Net loss $ (446,899) $ (316,319)
Employee benefit plans:    
Current period actuarial loss (60,647) (42,891)
Income tax 0 0
Current period actuarial (loss) gain, net of income tax (60,647) (42,891)
Less: reclassification adjustments for amounts reclassified to earnings due to amortization of net actuarial loss and settlements 7,278 7,405
Income tax 0 0
Less: reclamation adjustments for amounts reclassified to earnings due to amortization of net actuarial (gain) loss and settlements, net of income tax 7,278 7,405
Total other comprehensive loss, net of tax (53,369) (35,486)
Total comprehensive loss $ (500,268) $ (351,805)
v3.20.4
Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 139,227 $ 212,803
Trade accounts receivable, net of allowance for doubtful accounts of $293 and $0 as of December 31, 2020 and 2019 145,670 224,173
Inventories, net 108,051 150,888
Prepaid expenses and other current assets 106,252 77,723
Current assets - discontinued operations 10,935 45,892
Total current assets 510,135 711,479
Property, plant, and equipment, net of accumulated depreciation and amortization of $382,423 and $256,378 as of December 31, 2020 and 2019 363,620 436,398
Owned and leased mineral rights, net of accumulated depletion and amortization of $35,143 and $27,548 as of December 31, 2020 and 2019 463,250 523,012
Other acquired intangibles, net of accumulated amortization of $25,700 and $26,806 as of December 31, 2020 and 2019 88,196 124,246
Long-term restricted cash 96,033 122,524
Deferred income taxes 0 33,065
Other non-current assets 149,382 189,475
Non-current assets - discontinued operations 9,473 162,624
Total assets 1,680,089 2,302,823
Current liabilities:    
Current portion of long-term debt 28,830 28,476
Trade accounts payable 58,413 82,725
Acquisition-related obligations - current 19,099 33,639
Accrued expenses and other current liabilities 140,406 139,479
Current liabilities - discontinued operations 12,306 30,833
Total current liabilities 259,054 315,152
Long-term debt 553,697 564,458
Acquisition-related obligations - long-term 20,768 46,259
Workers’ compensation and black lung obligations 230,081 228,850
Pension obligations 218,671 204,086
Asset retirement obligations 140,074 164,406
Deferred income taxes 480 422
Other non-current liabilities 28,072 26,822
Non-current liabilities - discontinued operations 29,090 56,246
Total liabilities 1,479,987 1,606,701
Commitments and Contingencies (Note 23)
Stockholders’ Equity    
Preferred stock - par value $0.01, 5.0 million shares authorized, none issued 0 0
Common stock - par value $0.01, 50.0 million shares authorized, 20.6 million issued and 18.3 million outstanding at December 31, 2020 and 20.5 million issued and 18.2 million outstanding at December 31, 2019 206 205
Additional paid-in capital 779,424 775,707
Accumulated other comprehensive loss (111,985) (58,616)
Treasury stock, at cost: 2.3 million shares at December 31, 2020 and 2019 (107,014) (107,984)
(Accumulated deficit) retained earnings (360,529) 86,810
Total stockholders’ equity 200,102 696,122
Total liabilities and stockholders’ equity $ 1,680,089 $ 2,302,823
v3.20.4
Consolidated Balance Sheets - Parenthetical - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 293 $ 0
Less accumulated depreciation, depletion and amortization 382,423 256,378
Owned and leased mineral rights, accumulated depletion and amortization 35,143 27,548
Other acquired intangibles, accumulated amortization $ 25,700 $ 26,806
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 5,000,000.0 5,000,000.0
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 50,000,000.0 50,000,000.0
Common stock, shares issued (in shares) 20,600,000 20,500,000
Common stock, shares outstanding (in shares) 18,300,000 18,200,000
Treasury stock, shares at cost (in shares) 2,300,000 2,300,000
v3.20.4
Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating activities:    
Net loss $ (446,899) $ (316,319)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion and amortization 151,455 315,162
Amortization of acquired intangibles, net 10,075 (88)
Accretion of acquisition-related obligations discount 3,342 5,522
Amortization of debt issuance costs and accretion of debt discount 14,772 14,070
Mark-to-market adjustment for acquisition-related obligations (8,750) (3,564)
Loss on sale of business 36,113 0
(Gain) loss on disposal of assets (2,401) 8,142
Gain on assets acquired in an exchange transaction 0 (9,083)
Accretion on asset retirement obligations 30,658 33,759
Employee benefit plans, net 14,439 20,846
Deferred income taxes 33,123 (12,098)
Goodwill impairment 0 124,353
Asset impairment and restructuring 256,518 83,485
Loss on modification and extinguishment of debt 0 26,459
Stock-based compensation 4,896 12,397
Equity loss in affiliates 3,473 6,874
Other, net (5,972) (5,204)
Changes in operating assets and liabilities    
Trade accounts receivable, net 91,190 47,424
Inventories, net 48,689 (40,694)
Prepaid expenses and other current assets 28,152 56,671
Deposits (17,926) 15,170
Other non-current assets (6,753) (24,460)
Trade accounts payable (28,620) (28,148)
Accrued expenses and other current liabilities 15,428 (25,495)
Acquisition-related obligations (32,560) (28,128)
Asset retirement obligations (19,375) (111,616)
Other non-current liabilities (43,831) (33,557)
Net cash provided by operating activities 129,236 131,880
Investing activities:    
Capital expenditures (153,990) (192,411)
Proceeds on disposal of assets 4,023 2,780
Cash paid on sale of business (52,192) 0
Capital contributions to equity affiliates (3,443) (10,051)
Purchase of investment securities (21,129) (92,855)
Maturity of investment securities 16,685 100,250
Other, net 77 535
Net cash used in investing activities (209,969) (191,752)
Financing activities:    
Proceeds from borrowings on debt 57,500 544,946
Principal repayments of debt (59,768) (552,809)
Principal repayments of financing lease obligations (3,176) (3,654)
Debt issuance costs 0 (6,689)
Common stock repurchases and related expenses (209) (37,622)
Principal repayments of notes payable (16,723) (14,818)
Other, net 0 952
Net cash used in financing activities (22,376) (69,694)
Net decrease in cash and cash equivalents and restricted cash (103,109) (129,566)
Cash and cash equivalents and restricted cash at beginning of period 347,680 477,246
Cash and cash equivalents and restricted cash at end of period 244,571 347,680
Supplemental cash flow information:    
Cash paid for interest 49,294 51,877
Cash paid for income taxes 5 3,039
Cash received for income tax refunds 68,801 72,236
Supplemental disclosure of noncash investing and financing activities:    
Financing leases and capital financing - equipment 4,411 5,324
Accrued capital expenditures 7,493 4,110
Reconciliation of Cash and Cash Equivalents and Restricted Cash    
Total cash and cash equivalents and restricted cash shown in the Consolidated Statements of Cash Flows $ 244,571 $ 477,246
v3.20.4
Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Treasury Stock at Cost
Retained Earnings (Accumulated Deficit)
Retained Earnings (Accumulated Deficit)
Cumulative Effect, Period of Adoption, Adjustment
Beginning balance at Dec. 31, 2018 $ 1,071,140   $ 202 $ 761,301 $ (23,130) $ (70,362) $ 403,129  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net loss (316,319)           (316,319)  
Other comprehensive loss, net (35,486)       (35,486)      
Stock-based compensation and net issuance of common stock for share vesting 13,456   1 13,455        
Exercise of stock options 934   2 932        
Shares repurchased, amount 37,622         37,622    
Warrant exercises 19     19        
Ending balance at Dec. 31, 2019 696,122 $ (440) 205 775,707 (58,616) (107,984) 86,810 $ (440)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net loss $ (446,899)           (446,899)  
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member              
Other comprehensive loss, net $ (53,369)       (53,369)      
Stock-based compensation and net issuance of common stock for share vesting 3,718   1 3,717        
Shares repurchased, amount 970         970    
Ending balance at Dec. 31, 2020 $ 200,102   $ 206 $ 779,424 $ (111,985) $ (107,014) $ (360,529)  
v3.20.4
Business and Basis of Presentation
 12 Months Ended
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Business and Basis of Presentation Business and Basis of Presentation
Business
Alpha Metallurgical Resources, Inc. (“Alpha” or the “Company”), previously named Contura Energy, Inc., is a Tennessee-based mining company with operations across Virginia and West Virginia. With customers across the globe, high-quality reserves and significant port capacity, Alpha is a leading U.S. supplier of metallurgical products for the steel industry.
The Company was formed to acquire and operate certain of Alpha Natural Resources, Inc.’s core coal operations, as part of the Alpha Natural Resources, Inc. bankruptcy reorganization. The Company began operations on July 26, 2016 and currently operates mines in the Central Appalachia region.
A merger with ANR, Inc. and Alpha Natural Resources Holdings, Inc. (together, the "Merger Companies”) was completed on November 9, 2018 (the “Merger”) pursuant to terms of the definitive merger agreement (the “Merger Agreement”). Upon the consummation of the transactions contemplated by the Merger Agreement, the Company began trading on the New York Stock Exchange under the ticker “CTRA.”

Effective February 1, 2021, the Company changed its corporate name from Contura Energy, Inc. to Alpha Metallurgical Resources, Inc. to more accurately reflect its strategic focus on the production of metallurgical coal. Following the effectiveness of its name change, the Company’s ticker symbol on the New York Stock Exchange changed from “CTRA” to “AMR” effective on February 4, 2021.

Basis of Presentation

Together, the consolidated balance sheet and consolidated statements of operations, comprehensive loss, cash flows and stockholders’ equity for the Company are referred to as the “Financial Statements.” The Financial Statements are also referred to as “Consolidated” and references across periods are generally labeled “Balance Sheets,” “Statements of Operations,” and “Statements of Cash Flows.”
The Consolidated Financial Statements include all wholly owned subsidiaries’ results of operations for the years ended December 31, 2020 and 2019. All significant intercompany transactions have been eliminated in consolidation.

On December 10, 2020, the Company closed on a transaction with Iron Senergy Holdings, LLC, to sell its thermal coal mining operations located in Pennsylvania consisting primarily of our Cumberland mining complex and related property (the Company’s former Northern Appalachia (“NAPP”) operations). On December 8, 2017, the Company closed a transaction with Blackjewel L.L.C. to sell the Eagle Butte and Belle Ayr mines located in the Powder River Basin (“PRB”), Wyoming, along with related coal reserves, equipment, infrastructure and other real properties. Refer to Note 3 for information related to Blackjewel L.L.C.’s subsequent bankruptcy filing and the related ESM transaction. The Company’s former NAPP and PRB operations results of operations and financial position are reported as discontinued operations in the Consolidated Financial Statements. The historical information in the accompanying Notes 2, 3, 4, 6, 7, 9, 10, 11, 12, 14, 15, 17, 18, 19, 20, 23, 24, and 25 to the Consolidated Financial Statements has been restated to reflect the effects of the former NAPP and PRB operations being reported as discontinued operations in the Consolidated Financial Statements. Refer to Note 3 for further information on discontinued operations.

The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”).
Liquidity Risks and Uncertainties

Weak market conditions and depressed coal prices have resulted in operating losses. If market conditions do not improve, the Company may experience continued operating losses and cash outflows in the coming quarters, which would adversely affect its liquidity. The Company may need to raise additional funds more quickly if market conditions deteriorate and may not be able to do so in a timely fashion, or at all. The Company believes it will have sufficient liquidity to meet its working capital requirements, anticipated capital expenditures, debt service requirements, acquisition-related obligations, and reclamation obligations for the 12 months subsequent to the issuance of these financial statements. The Company relies
on a number of assumptions in budgeting for future activities. These include the costs for mine development to sustain capacity of its operating mines, cash flows from operations, effects of regulation and taxes by governmental agencies, mining technology improvements and reclamation costs. These assumptions are inherently subject to significant business, political, economic, regulatory, environmental and competitive uncertainties, contingencies and risks, all of which are difficult to predict and many of which are beyond the Company’s control. Therefore, the cash on hand and from future operations will be subject to any significant changes in these assumptions.

COVID-19 Pandemic

In the first quarter of 2020, the COVID-19 virus was declared a pandemic by the World Health Organization. The COVID-19 pandemic has had negative impacts on the Company’s business, results of operations, financial condition and cash flows. A continued period of reduced demand for the Company’s products could have significant adverse consequences. The full extent of the impact of the COVID-19 pandemic on the Company’s operational and financial performance will depend on certain developments, including the duration and spread of the outbreak, its impact on its customers and suppliers and the range of governmental and community reactions to the pandemic, which are still uncertain and cannot be fully predicted at this time.

As further described in Note 15, on March 20, 2020, the Company borrowed funds under a senior secured asset-based revolving credit facility. The funds were borrowed to augment the Company’s short-term operational flexibility in the face of uncertainty created by the current spread of the COVID-19 virus and its potential effects. In the first quarter of 2021, the Company repaid the remaining $3,350 of borrowed funds as of December 31, 2020.

In response to the COVID-19 pandemic, on March 27, 2020, the “Coronavirus Aid, Relief, and Economic Security
Act” (“CARES Act”) was enacted into law. As a result, the Company received $66,130 of accelerated refunds of previously generated alternative minimum tax (“AMT”) credits from the Internal Revenue Service (“IRS”) during the fourth quarter of 2020 as further described in Note 19 and deferred 2020 employer payroll taxes incurred after the date of enactment of $15,109, including discontinued operations, with two future payments of $7,554 each due by December 31, 2021 and 2022.

On April 3, 2020, the Company announced temporary operational changes in response to market conditions, existing coal inventory levels, and customer deferrals due to concern around the global economic impact of the COVID-19 pandemic. Beginning April 3, 2020, the majority of the Company’s operations were idled for a period of approximately 30 days, with some sites idling for shorter periods of time and a few continuing to operate at a near-normal rate of production. Location-specific schedules were implemented based on existing customer agreements, current inventory levels, and anticipated customer demand. Certain preparation plants, docks, and loadouts continued to operate to support business needs and customer shipments. As of May 4, 2020, all Company sites were back to nearly normal staffing levels and operating capacity with additional precautions in place to help reduce the risk of exposure to COVID-19. Refer to Note 8 for discussion of certain strategic actions announced during the second quarter of 2020 with respect to two thermal coal mining complexes in an effort to strengthen the Company’s financial performance. The Company will continue to evaluate market conditions amid the continuing uncertainty of the COVID-19 pandemic and expects to adjust its operations accordingly.
v3.20.4
Summary of Significant Accounting Policies
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Summary of Significant Accounting Policies Summary of Significant Accounting Policies
Use of Estimates

The preparation of the Company’s Consolidated Financial Statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period. Significant items subject to such estimates and assumptions include inventories; mineral reserves; asset impairments; goodwill impairment; reclamation obligations; post-employment and other employee benefit obligations; useful lives, depletion and amortization; reserves for workers’ compensation and black lung claims; deferred income taxes; income taxes refundable and receivable; reserves for contingencies and litigation; fair value of financial instruments; and fair value adjustments for acquisition accounting. Estimates are based on facts and circumstances believed to be reasonable at the time; however, actual results could differ from those estimates.
Cash and Cash Equivalents

 Cash and cash equivalents consist of cash held with reputable depository institutions and highly liquid, short-term investments with original maturities of three months or less. Cash and cash equivalents are stated at cost, which approximates fair value. As of December 31, 2020 and December 31, 2019, the Company’s cash equivalents of $139,227 and $212,803, respectively, consisted of highly-rated money market funds.

Restricted Cash

Amounts included in restricted cash represent cash deposits that are restricted as to withdrawal as required by certain agreements entered into by the Company and provide collateral in the amounts of $69,725, $8,445, and $17,863 as of December 31, 2020 to secure workers’ compensation and black lung obligations, reclamation-related obligations, and financial payments and other performance obligations, respectively, which have been written on the Company’s behalf. As of December 31, 2019, collateral was provided in the amounts of $51,650, $67,868, and $3,006 to secure workers’ compensation and black lung obligations, reclamation-related obligations, and financial payments and other performance obligations, respectively, which have been written on the Company’s behalf. The Company’s restricted cash is primarily invested in interest-bearing accounts. This restricted cash is classified as long-term on the Company’s Consolidated Balance Sheets. Additionally, as of December 31, 2020 and 2019, the Company had $9,311 and $12,363, respectively, of short-term restricted cash held in escrow related to the Company’s contingent revenue payment obligation. Refer to Note 16 for further information regarding the contingent payment revenue obligation.

Restricted Investments

Restricted investments consist of Federal Deposit Insurance Company (“FDIC”) insured certificates of deposit, mutual funds, and U.S. treasury bills classified as either trading securities or held-to-maturity securities. Trading securities are recorded initially at cost and are adjusted to fair value at each reporting period with unrealized gains and recorded in current period earnings or loss. Held-to-maturity securities are recorded at amortized cost with interest income recorded in current period earnings. As of December 31, 2020, $22,498 and $1,270 were classified as trading and held-to-maturity securities, respectively. As of December 31, 2019, $11,021 and $8,378 were classified as trading and held-to-maturity securities, respectively. Given the nature of the underlying investments, the Company does not expect any credit losses and has not recorded any credit losses with respect to its held-to-maturity portfolio.

Restricted investments are restricted as to withdrawal by certain agreements and provide collateral in the amounts of $51, $22,233, and $1,484 as of December 31, 2020 to secure workers’ compensation obligations, reclamation-related obligations, and financial payments and other performance obligations, respectively. As of December 31, 2019, collateral was provided in the amounts of $613 and $18,786 to secure workers’ compensation obligations and reclamation-related obligations, respectively. These restricted investments are classified as long-term on the Company’s Consolidated Balance Sheets.

Deposits

Deposits represent cash deposits held at third parties as required by certain agreements entered into by the Company to provide cash collateral. The Company had cash collateral in the form of deposits in the amounts of $25,633, $1,596, and $1,018 as of December 31, 2020 to secure reclamation-related obligations, financial payments and other performance obligations, and various other operating agreements, respectively. The Company had cash collateral in the form of deposits in the amounts of $8,887 and $1,423 as of December 31, 2019 to secure the Company’s obligations under reclamation-related obligations and various other operating agreements, respectively. These deposits are classified as both short-term and long-term on the Company’s Consolidated Balance Sheets.

Trade Accounts Receivable and Allowance for Doubtful Accounts

Trade accounts receivable are recorded at their invoiced amounts and do not bear interest. The Company markets its coal primarily to domestic and international steel producers and electric utilities in the United States. Credit is extended based on an evaluation of a customer’s financial condition, including a review of third-party credit score information. Collateral is generally not required. Accounts receivable balances are monitored against approved credit limits. Credit limits are monitored and adjusted as considered necessary based on changes to a customer’s credit profile. If a customer’s credit deteriorates, the Company may reduce credit risk exposure by reducing credit limits, obtaining letters of credit, obtaining credit insurance, or requiring pre-payment for shipments. Credit losses have historically not been material. Account balances are written-off against
the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. Refer to Note 24 for further information.

Inventories

Coal is reported as inventory at the point in time the coal is extracted from the mine. Raw coal represents coal stockpiles that may be sold in current condition or may be further processed prior to shipment to a customer. Saleable coal represents coal stockpiles that require no further processing prior to shipment to a customer.

Coal inventories are valued at the lower of average cost or net realizable value. The cost of coal inventories is determined based on the average cost of production, which includes labor, supplies, equipment costs, operating overhead, depreciation, and other related costs. Net realizable value considers the projected future sales price of the product, less estimated preparation and selling costs.

Material and supplies inventories are valued at average cost, less an allowance for obsolete and surplus items.

Discontinued Operations

In accordance with Accounting Standards Codification (“ASC”) 205-20-45, the Company treats a disposal transaction as a discontinued operation when the disposal of a component or group of components represents a strategic shift that will have a major effect on the Company’s operations and financial results. In the period in which the discontinued operations criteria are met, the assets and liabilities of the discontinued operations are separately presented on the Company's Consolidated Balance Sheets and the results of operations, including any gain or loss recognized, is reclassified to discontinued operations on the Company’s Consolidated Statement of Operations. Refer to Note 3 for further information on discontinued operations.

Deferred Longwall Move Expenses

The Company deferred the direct costs, including labor and supplies, associated with moving longwall equipment, the related equipment refurbishment costs, costs to drill vent holes and plug existing gas wells in advance of the longwall panel associated with its former NAPP operations included in discontinued operations of the Consolidated Balance Sheets as of December 31, 2020 and 2019. Refer to Note 3. These deferred costs were amortized on a units-of-production basis into cost of coal sales over the life of the related panel of coal mined by the longwall equipment.

Advanced Mining Royalties

Lease rights to coal reserves are often acquired in exchange for royalty payments. Advance mining royalties are advance payments made to lessors under terms of mineral lease agreements that are recoupable against future production royalties. These advance payments are deferred and charged to operations as the coal reserves are mined. The Company regularly reviews recoverability of advance mining royalties and establishes or adjusts the allowance for advance mining royalties as necessary using the specific identification method. Advance royalty balances are generally charged off against the allowance when they are no longer recoupable.

Property, Plant, and Equipment, Net

Costs for mine development incurred to expand capacity of operating mines or to develop new mines are capitalized and charged to operations on the units-of-production method over the estimated proven and probable reserve tons directly benefiting from the capital expenditures. Mine development costs include costs incurred for site preparation and development of the mines during the development stage less any incidental revenue generated during the development stage. Mining equipment, buildings and other fixed assets are stated at cost and depreciated on a straight-line basis over estimated useful lives ranging from one to 25 years. Leasehold improvements are amortized using the straight-line method, over the shorter of the estimated useful lives or term of the lease. Major repairs and betterments that significantly extend original useful lives or improve productivity are capitalized and depreciated over the period benefited. Maintenance and repairs are expensed as incurred. When equipment is retired or disposed, the related cost and accumulated depreciation are removed from the respective accounts and any profit or loss on disposal is recognized in other (income) expense in the Company’s Consolidated Statements of Operations. Costs to obtain owned and leased mineral rights are capitalized and amortized to operations as depletion expense using the units-of-production method. Only proven and probable reserves are included in the depletion base. Refer to Note 10 for further detail on
property, plant and equipment, net.

Owned and Leased Mineral Rights

Owned and leased mineral rights, net of accumulated depletion, for the years ended December 31, 2020 and 2019 were $463,250 and $523,012, respectively, and are reported in assets in the Company’s Consolidated Balance Sheets. These amounts include $10,491 and $36,723 of asset retirement obligation assets, net of accumulated depletion, associated with active mining operations for the years ended December 31, 2020 and 2019, respectively. During the year ended December 31, 2020 and 2019, the Company recorded a long-lived asset impairment which reduced the carrying value of owned and leased mineral rights, net, by $41,579 and $35,445, respectively. Refer to the asset impairment disclosure included in Note 8.

Costs to obtain owned and leased mineral rights are capitalized and amortized to operations as depletion expense using the units-of-production method. Only proven and probable reserves are included in the depletion base. Depletion expense is included in depreciation, depletion and amortization on the accompanying Consolidated Statements of Operations and was ($13,746) and $14,551 for the years ended December 31, 2020 and 2019, respectively.

Depletion expense for the years ended December 31, 2020 and 2019 includes a credit of ($34,377) and ($7,162), respectively, related to revisions to asset retirement obligations. Refer to Note 17 for further disclosures related to asset retirement obligations.

Leases

In accordance with ASC 842, the Company recognizes right of use assets and lease liabilities on the balance sheet for all leases with a term longer than 12 months. Some of these leases include both lease and non-lease components which are accounted for as a single lease component as the Company has elected the practical expedient to combine these components for all leases. The discount rates used to determine the present value of the lease assets and liabilities are based on the Company’s incremental borrowing rate at the lease commencement date and commensurate with the remaining lease term. As the rates implicit in most of the Company’s leases are not readily determinable, the Company uses a collateralized incremental borrowing rate based on the information available at the lease commencement date in determining the present value of future payments. The Company uses the portfolio approach and group leases by short-term and long-term categories, applying the corresponding incremental borrowing rates to these categories of leases. For leases with a term of 12 months or less, no right of use assets or liabilities are recognized on the balance sheet and the Company recognizes the lease expense on a straight-line basis over the lease term. Additionally, the Company recognizes variable lease payments as an expense in the period incurred.

Refer to Note 12 for disclosures related to leases and the Recently Adopted Accounting Guidance section below for further detail related to the initial adoption of the leases accounting standards.

Acquired Intangibles

The Company has recognized assets for acquired above market-priced coal supply agreements and acquired mine permits and liabilities for acquired below market-priced coal supply agreements. The coal supply agreements were valued based on the present value of the difference between the expected net contractual cash flows based on the stated contract terms, and the estimated net contractual cash flows derived from applying forward market prices at the Merger or acquisition date for new contracts of similar terms and conditions. The acquired mine permits were valued based on the replacement cost and lost profits method as of the Merger date. The balances and respective balance sheet classifications of such assets and liabilities as of December 31, 2020 and 2019, net of accumulated amortization, are set forth in the following tables:
December 31, 2020
Assets (1)
Liabilities (2)
Net Total
Coal supply agreements, net$— $(327)$(327)
Acquired mine permits, net88,196 — 88,196 
Total$88,196 $(327)$87,869 
December 31, 2019
Assets (1)
Liabilities (2)
Net Total
Coal supply agreements, net$18 $(6,018)$(6,000)
Acquired mine permits, net124,228 — 124,228 
Total$124,246 $(6,018)$118,228 
(1) Included within other acquired intangibles, net of accumulated amortization, on the Company’s Consolidated Balance Sheets.
(2) Included within other non-current liabilities on the Company’s Consolidated Balance Sheets.

During the years ended December 31, 2020 and 2019, the Company recorded long-lived asset impairments which reduced the carrying value of acquired mine permits, net, by $21,144 and $5,997. Refer to Note 8 for further information.

The acquired mine permits are amortized over the estimated life of the associated mine. The coal supply agreement assets and liabilities are amortized over the actual number of tons shipped over the life of each contract. The following table details the amortization of mine permits acquired as a result of the Merger and the amortization of above-market and below-market coal supply agreements.
December 31,
20202019
Amortization of mine permits (1)
$14,887 $23,921 
Amortization of above-market coal supply agreements$18 $783 
Amortization of below-market coal supply agreements(5,691)(27,893)
Net income (1)
$(5,673)$(27,110)
(1) Included within amortization of acquired intangibles, net in the Consolidated Statements of Operations.


Future net amortization expense related to acquired intangibles is expected to be as follows:  
2021$9,712 
202210,039 
202310,028 
20248,677 
20258,672 
Thereafter40,741 
Total net future amortization expense$87,869 

Goodwill

Goodwill represents the excess of the purchase price over the fair value of the net identifiable tangible and intangible assets of acquired companies. In connection with the Merger in 2018, the Company recorded goodwill of $124,353 and allocated it to the Met reportable segment. Goodwill is not amortized; instead, it is tested for impairment annually as of October 31 of each year or more frequently if indicators of impairment exist.

The Company performed an interim goodwill impairment test as of August 31, 2019 due to a decline in the Company’s market capitalization to amounts below book value combined with a decline in global metallurgical coal pricing which indicated that the fair value of the Met segment reporting unit may have been below its carrying value. Following the quantitative testing, the Company concluded that the fair value of the reporting unit exceeded its carrying value and no amount of goodwill was impaired. As of October 31, 2019, the Company performed its annual goodwill impairment test and concluded that more likely than not the fair value of its Met reporting unit to which the Company’s goodwill is allocated exceeded its carrying value. As a result, no amount of goodwill was considered impaired as a result of impairment testing at October 31, 2019.
However, due to the continued weakening in coal market pricing combined with a significant market price decline for the Company’s stock late in the fourth quarter of 2019, the Company performed an interim goodwill impairment test as of December 31, 2019. Following the quantitative testing, the Company concluded that the carrying value of the Met reporting unit exceeded its fair value and recorded a goodwill impairment of $124,353 to write down the full carrying amount of goodwill.

The Company early adopted Accounting Standards Update (“ASU”) 2017-04 for the period ended December 31, 2017, which eliminated Step 2 of the quantitative goodwill impairment test. The Company first assesses goodwill for impairment on a qualitative basis. If the Company determines that more likely than not the fair value of a reporting unit containing goodwill exceeds its carrying amount, no further impairment testing is required. If the qualitative assessment indicates that an impairment potentially exists, then the Company quantitatively tests goodwill for impairment by comparing the fair value of the reporting unit to its carrying amount. If the fair value of the reporting unit is lower than its carrying amount, its goodwill is written down by the lesser of the amount by which the reporting units carrying amount exceeded its fair value or its carrying amount of goodwill.

The valuation methodology utilized to estimate the fair value of the reporting units is based on both a market and income approach and is within the range of fair values yielded under each approach. The income approach is based on a discounted cash flow methodology based on estimates of future sales volumes, coal prices, production costs, and a risk-adjusted cost of capital. These estimates generally constitute unobservable Level 3 inputs under the fair value hierarchy. The market approach is based on a guideline company and similar transaction methodology. Under the guideline company approach, certain metrics from a selected group of publicly traded guideline companies that have similar operations to the Company’s reporting units are used to estimate the fair value of the reporting units. Under the similar transactions approach, recent merger and acquisition transactions for companies that have similar operations to the Company’s reporting units are used to estimate the fair value of the Company’s reporting units.

The following table summarizes the changes in goodwill for the year ended December 31, 2019:

Balance as of December 31, 2018
Measurement-Period Adjustments (2)
ImpairmentsBalance as of December 31, 2019
Goodwill (1)
$95,624 $28,729 $(124,353)$— 
(1) There was no goodwill activity during the year ended December 31, 2020.
(2) Prior to the finalization of the Merger purchase price allocation, the Company recorded measurement-period adjustments to the provisional opening balance sheet primarily to property, plant, and equipment, owned and leased mineral rights, asset retirement obligations, and certain actuarial liabilities.

Asset Impairment

Long-lived assets, such as property, plant, and equipment, mineral rights, and acquired intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset groups may not be recoverable. Recoverability of assets or asset groups to be held and used is measured by a comparison of the carrying amount of an asset or asset group to the estimated undiscounted future cash flows expected to be generated by the asset or asset group. Long-lived assets located in a close geographic area are grouped together for purposes of impairment testing when, after considering revenue and cost interdependencies, circumstances indicate the assets are used together to produce future cash flows. The Company’s asset groups generally consist of the assets and applicable liabilities of one or more mines and preparation plants and associated coal reserves for which cash flows are largely independent of cash flows of other mines, preparation plants, and associated coal reserves. If the carrying amount of an asset or asset group exceeds its estimated future cash flows, the potential impairment is equal to the amount by which the carrying amount of the asset or asset group exceeds the fair value of the asset or asset group. The Company estimates the fair value of an asset group generally using discounted cash flow analysis based on estimates of future sales volumes, coal prices, production costs, and a risk-adjusted cost of capital. These estimates generally constitute unobservable Level 3 inputs under the fair value hierarchy. The amount of impairment, if any, is allocated to the long-lived assets on a pro-rata basis, except that the carrying value of the individual long-lived assets are not reduced below their estimated fair value. Refer to Note 8.
Asset Retirement Obligations

Minimum standards for mine reclamation have been established by various regulatory agencies and dictate the reclamation requirements at the Company’s operations. The Company’s asset retirement obligations consist principally of costs to reclaim acreage disturbed at surface operations and estimated costs to reclaim support acreage, treat mine water discharge, and perform other related functions at underground mines. The Company records these reclamation obligations at fair value in the period in which the legal obligation associated with the retirement of the long-lived asset is incurred. Changes to the liability at operations that are not currently being reclaimed are offset by increasing or decreasing the carrying amount of the related long-lived asset. Changes to the liability at operations that are currently being reclaimed are recorded to depreciation, depletion, and amortization. Over time, the liability is accreted and any capitalized cost is depreciated or depleted over the useful life of the related asset. To settle the liability, the obligation is paid, and to the extent there is a difference between the liability and the amount of cash paid, a gain or loss upon settlement is recorded. The Company annually reviews its estimated future cash flows for its asset retirement obligations. Refer to Note 17 for further disclosures related to asset retirement obligations.

During the year ended December 31, 2019, the Company recorded a long-lived asset impairment which reduced the carrying value of long-lived assets related to asset retirement obligations by $1,671. Refer to the asset impairment disclosure included in Note 8.

Income Taxes

The Company recognizes deferred tax assets and liabilities using enacted tax rates for the effect of temporary differences between the book and tax basis of recorded assets and liabilities. Deferred tax assets are reduced by a valuation allowance if it is more likely than not that some portion or all of the deferred tax asset will not be realized. In evaluating its ability to recover deferred tax assets within the jurisdiction in which they arise, the Company considers all available positive and negative evidence, including the expected reversals of taxable temporary differences, projected future taxable income, taxable income available via carryback to prior years, tax planning strategies, and results of recent operations. The Company assesses the realizability of its deferred tax assets, including scheduling the reversal of its deferred tax assets and liabilities, to determine the amount of valuation allowance needed. Scheduling the reversal of deferred tax asset and liability balances requires judgment and estimation. The Company believes that the deferred tax liabilities relied upon as future taxable income in its assessment will reverse in the same period and jurisdiction and are of the same character as the temporary differences giving rise to the deferred tax assets that will be realized. Refer to Note 19 for further disclosures related to income taxes.

Deferred Financing Costs

The costs to obtain new debt financing or amend existing financing agreements are generally deferred and amortized to interest expense over the life of the related indebtedness or credit facility using the effective interest method. Unamortized deferred financing costs are presented in the Consolidated Balance Sheet as a direct deduction from the carrying amount of the debt liability, consistent with debt discounts or premiums. Unamortized deferred financing costs associated with undrawn credit facilities are included in the Consolidated Balance Sheets within other non-current assets.

Revenue Recognition

In accordance with ASC 606 Revenue from Contracts with Customers (“ASC 606”), the Company measures revenue based on the consideration specified in a contract with a customer and recognizes revenue as a result of satisfying its promise to transfer goods or services in a contract with a customer using the following general revenue recognition five-step model: (1) identify the contract; (2) identify performance obligations; (3) determine transaction price; (4) allocate transaction price; and (5) recognize revenue. Freight and handling costs paid to third-party carriers and invoiced to coal customers are recorded as freight and handling costs and freight and handling fulfillment revenues within cost of coal sales and coal revenues, respectively. Refer to Note 4 for further disclosures related to revenue.

Workers’ Compensation and Pneumoconiosis (Black Lung) Benefits 

Workers’ Compensation

As of December 31, 2020, the Company’s subsidiaries generally utilize high-deductible insurance programs for workers’ compensation claims at its operations with the exception of certain subsidiaries in which the Company is a qualified self-insurer
for workers’ compensation obligations. The liabilities for workers’ compensation claims are estimates of the ultimate losses incurred based on the Company’s experience and include a provision for incurred but not reported losses. Adjustments to the probable ultimate liabilities are made annually based on an actuarial study and adjustments to the liability are recorded based on the results of this study. These short-term and long-term obligations are included in the Consolidated Balance Sheets within accrued expenses and other current liabilities and workers’ compensation and black lung obligations, respectively, with an offsetting insurance receivable within prepaid expenses and other current assets and other non-current assets. As of December 31, 2020 and 2019, the workers’ compensation liability was net of a discount of $24,061 and $24,680, respectively, related to fair value adjustments associated with acquisition accounting. Refer to Note 20 for further disclosures related to workers’ compensation.

Black Lung Benefits

The Company is required by federal and state statutes to provide benefits to employees for awards related to black lung. As of December 31, 2020, certain of the Company’s subsidiaries are insured for black lung obligations by a third-party insurance provider and certain subsidiaries are self-insured for state black lung obligations. Certain other subsidiaries are self-insured for federal black lung benefits and may fund benefit payments through a Section 501(c)(21) tax-exempt trust fund. Charges are made to operations for black lung claims, as determined by an independent actuary at the present value of the actuarially computed liability for such benefits over the employee’s applicable term of service. The Company recognizes in its balance sheet the amount of the Company’s unfunded Accumulated Benefit Obligation (“ABO”) at the end of the year. Amounts recognized in accumulated other comprehensive income (loss) are adjusted out of accumulated other comprehensive income (loss) when they are subsequently recognized as components of net periodic benefit cost. These short-term and long-term obligations are included in the Consolidated Balance Sheets within accrued expenses and other current liabilities and workers’ compensation and black lung obligations, respectively. Refer to Note 20 for further disclosures related to black lung benefits.

Pension

The Company is required to recognize the overfunded or underfunded status of a defined benefit pension plan as an asset or liability in its Consolidated Balance Sheets and to recognize changes in that funded status in the year in which the changes occur through other comprehensive (loss) income. The Company is required to measure plan assets and benefit obligations as of the date of the Company’s fiscal year-end Consolidated Balance Sheet and provide the required disclosures as of the end of each fiscal year. Refer to Note 20 for further disclosures related to pension.
Postretirement Life Insurance Benefits

As part of the Alpha Natural Resources, Inc. bankruptcy reorganization plan and the Retiree Committee Settlement Agreement, the Company assumed the liability for life insurance benefits for certain disabled and non-union retired employees. Provisions are made for estimated benefits based on annual evaluations prepared by independent actuaries. Adjustments to the probable ultimate liabilities are made annually based on an actuarial study and adjustments to the liability are recorded based on the results of this study. These obligations are included in the Consolidated Balance Sheet as accrued expenses and other current liabilities and other non-current liabilities. Refer to Note 20 for further disclosures related to postretirement life insurance benefits.

Net (Loss) Income per Share

 Basic net (loss) income per share is computed by dividing net (loss) income by the weighted-average number of outstanding common shares for the period. Diluted (loss) earnings per share reflects the potential dilution that could occur if instruments that may require the issuance of common shares in the future were settled and the underlying common shares were issued. Diluted (loss) earnings per share is computed by increasing the weighted-average number of outstanding common shares computed in basic (loss) earnings per share to include the additional common shares that would be outstanding after issuance and adjusting net (loss) income for changes that would result from the issuance. Only those securities that are dilutive are included in the calculation. In periods of loss, the number of shares used to calculate diluted earnings is the same as basic earnings per share. Refer to Note 6 for further disclosures related to net (loss) income per share.

Stock-Based Compensation

The Company recognizes expense for stock-based compensation awards based on their grant-date fair value. The expense
is recorded over the respective service period of the underlying award. Liability classified stock-based compensation awards are remeasured each reporting period at fair value until the award is settled. The Company recognizes forfeitures of stock-based compensation awards as they occur. Refer to Note 21 for further disclosures related to stock-based compensation arrangements.

Warrants

On July 26, 2016 (the “Initial Issue Date”), the Company issued 810,811 warrants, which are classified as equity instruments, each with an initial exercise price, as defined in the Series A Warrants Agreement (the “Warrants Agreement”), of $55.93 per share of common stock and exercisable for one share of the Alpha’s common stock, par value $0.01 per share. Pursuant to the Warrants Agreement, the warrants are exercisable for cash or on a cashless basis at any time from the Initial Issue Date until July 26, 2023, and no fractional shares shall be issued upon warrant exercises. The exercise price and the warrant share number will be adjusted in respect of certain dilutive events with respect to the common stock (namely, dividends or distributions on the common stock, share splits and combinations, above-market tender offers for common stock by the Company or a subsidiary thereof, and discounted issuances of common stock or rights or options to purchase common stock or securities convertible or exchangeable into common stock). Additionally, in the case of any reorganization (i.e., a consolidation, merger, or sale of all or substantially all of the consolidated assets of Alpha) pursuant to which the common stock is converted into cash, securities or other property, the warrants would become exercisable for such property. As of December 31, 2020 and 2019, the exercise price was $46.911 per share and the warrant share number was equal to 1.15, as adjusted in respect to certain diluted events with respect to the common stock during 2017 and 2018.
As of December 31, 2020 and 2019, of the 810,811 warrants that were originally issued, 801,370 remained outstanding, with a total of 921,576 shares underlying the un-exercised warrants. For the year ended December 31, 2020, there were no warrant exercises. For the year ended December 31, 2019, the Company issued 414 shares of common stock resulting from exercises of its Series A Warrants and, pursuant to the terms of the Warrants Agreement, withheld five of the issued shares in satisfaction of the warrant exercise price, which were subsequently reclassified as treasury stock.

Equity Method Investments

Investments in unconsolidated affiliates that the Company has the ability to exercise significant influence over, but not control, are accounted for under the equity method of accounting. Under the equity method of accounting, the Company records its proportionate share of the entity’s net income or loss at each reporting period in the Consolidated Statements of Operations in other (expense) income, with a corresponding entry to increase or decrease the carrying value of the investment. The carrying value of the Company’s equity method investments was $18,383 and $18,413 as of December 31, 2020 and 2019, respectively.

Recently Adopted Accounting Guidance

Leases: In February 2016, the Financial Accounting Standards Board (the “FASB”) issued an Accounting Standards Update and subsequent amendments related to ASC 842, Leases, (“ASC 842”). ASC 842 requires a lessee to recognize a right-of-use asset and a lease liability on the balance sheet. The Company adopted ASC 842 effective January 1, 2019 and elected the option not to restate comparative periods in transition and also elected the hindsight practical expedient, which allows the Company to use hindsight when considering lessee options to extend or terminate leases when determining the lease term of lease arrangements for classification purposes, and the package of practical expedients for all leases within the standard, which permits the Company not to reassess its prior conclusions about lease identification, lease classification, and initial direct costs. Additionally, the Company elected the transition practical expedient to continue to account for existing and expired land easements at transition as executory contracts. Only land easements entered into or modified after the effective date of ASC 842 are accounted for as leases by the Company.

As a result of the adoption, the Company recorded operating lease right-of-use assets and lease liabilities on our Consolidated Balance Sheet. The following table summarizes the impact of the adoption of ASC 842 to the Company’s Consolidated Balance Sheet:
 Balance at December 31, 2018AdjustmentsBalance at January 1, 2019
AssetsBalance Sheet Classification 
Operating lease right-of-use assetsOther non-current assets$— $10,136 $10,136 
Financing lease assetsProperty, plant, and equipment, net9,786 — 9,786 
Total lease assets$9,786 $10,136 $19,922 
LiabilitiesBalance Sheet Classification
Operating lease liabilities - currentAccrued expenses and other current liabilities$— $3,232 $3,232 
Financing lease liabilities - currentCurrent portion of long-term debt2,110 — 2,110 
Operating lease liabilities - long-termOther non-current liabilities— 6,904 6,904 
Financing lease liabilities - long-termLong-term debt4,313 — 4,313 
Total lease liabilities$6,423 $10,136 $16,559 

The adoption of ASC 842 did not have a material impact on our Consolidated Statements of Operations, Consolidated Statements of Comprehensive Loss, or Consolidated Statements of Cash Flows. Refer to Note 12 for further disclosure requirements under the new standard.

Credit Losses: In June 2016, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2016-13, Credit Losses (“ASU 2016-13”). ASU 2016-13, along with related amendments and improvements issued in 2018 and 2019, replaces the previous incurred loss impairment methodology in U.S. GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable supportable information to inform credit loss estimates for financial instruments that are in the scope of this update, including trade accounts receivable. The Company adopted ASU 2016-13 during the first quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Consolidated Financial Statements and related disclosures and resulted in a cumulative-effect adjustment to retained earnings of $440 in the Consolidated Balance Sheet as of January 1, 2020.

Fair Value Measurement: In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820), Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement (“ASU 2018-13”). The amendments in this update modify the disclosure requirements for fair value measurements. The Company adopted ASU 2018-13 during the first quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Consolidated Financial Statements and related disclosures.

Income Taxes: In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”). The amendments in this update simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The amendments also improve consistent application of and simplify U.S. GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The Company adopted ASU 2019-12 during the first quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Consolidated Financial Statements and related disclosures.

Reference Rate Reform: In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of Effects of Reference Rate Reform on Financial Reporting (“ASU 2020-04”). The amendments in this update provide optional expedients and exceptions, if certain criteria are met, for applying U.S. GAAP to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The expedients and exceptions provided by the amendments do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. The Company adopted ASU 2020-04, with respect to topics in Accounting Standards Codification (“ASC”) 310 Receivables, ASC 470 Debt, ASC 815 Derivatives and Hedging and ASC 842 Leases, during the first quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Consolidated Financial Statements and related disclosures.

Defined Benefit Plans: In August 2018, the FASB issued ASU 2018-14, Compensation—Retirement Benefits—Defined
Benefit Plans—General (Subtopic 715-20) Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans (“ASU 2018-14”). The amendments in this update modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. For public business entities, the standard is effective for fiscal years ending after December 15, 2020. The Company adopted ASU 2018-14 during the fourth quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Consolidated Financial Statements and related disclosures.

Recent Accounting Guidance Issued Not Yet Effective

Convertible Debt and Contracts in Entity’s Own Equity: In August 2020, the FASB issued ASU 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40) (“ASU 2020-06”). The amendments in this update simplify the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts in an entity’s own equity, such as the Company’s outstanding Series A warrants. For public business entities, the standard is effective for fiscal years beginning after December 15, 2021, with early adoption permitted. The adoption of this ASU is not expected to have a material impact on the Company’s Consolidated Financial Statements and related disclosures.
v3.20.4
Discontinued Operations
 12 Months Ended
Dec. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]  
Discontinued Operations Discontinued Operations
Discontinued operations consisted of activity related to the Company’s former NAPP and PRB operations.

Former NAPP Operations

On November 11, 2020, the Company entered into an unit purchase agreement (the “UPA”) to sell its thermal coal mining operations located in Pennsylvania consisting primarily of its Cumberland mining complex and related property (“Cumberland Transaction”) to a third party purchaser Iron Senergy Holdings, LLC (“Iron Senergy”). The Cumberland Transaction closed on December 10, 2020. In accordance with terms of the UPA, the Company transferred its equity interests in certain subsidiaries (Cumberland Contura, LLC, Contura Coal Resources, LLC, Contura Pennsylvania Land, LLC, Emerald Contura, LLC, and Contura Pennsylvania Terminal, LLC) along with total consideration of $49,987 to Iron Senergy. Pursuant to the terms of the UPA, the Company also retained certain assets and liabilities associated with its former NAPP operations. The mining permits associated with the Cumberland mining operations were obtained by Iron Senergy at closing. Due to the administrative process, the Company expects the release of the Company’s existing surety bonds and the acceptance of Iron Senergy’s replacement bonds to be completed by March 30, 2021.

The following table presents the details of the Cumberland Transaction:
Year Ended December 31, 2020
Cash$19,987 
Surety bonding collateral30,000 
Total consideration49,987 
Transaction costs2,205 
Carrying value of assets and liabilities (1)
$(16,079)
Loss on sale$36,113 
(1) Assets and liabilities were primarily comprised of property, plant and equipment, net of $32,872, deferred longwall move expenses of $15,173, and coal and supplies inventory of $5,112 and asset retirement obligations of $39,573, severance of $17,143, black lung obligations of $8,290, and subsidence liability of $3,559.

In connection with the UPA, the Company entered into certain agreements with Iron Senergy under which Iron Senergy will sell to the Company all of the coal that the Company is obligated to sell to customers under Cumberland coal supply agreements (“Cumberland CSAs”) which existed as of the transaction closing date but did not transfer to Iron Senergy at closing (each, a “Cumberland Back-to-Back Coal Supply Agreement”). Each Cumberland Back-to-Back Coal Supply Agreement has economic terms identical to, but offsetting, the related Cumberland CSA. If a Cumberland customer subsequently consents to assign a Cumberland CSA to Iron Senergy after closing, the related Cumberland CSA will immediately and automatically transfer to Iron Senergy and the related Cumberland Back-to-Back Coal Supply Agreements executed by the parties shall thereupon terminate as set forth therein. As the Company does not control the purchased coal prior to customer delivery, the Company will record coal purchases and sales under the related agreements on a net basis. Per terms
of the Cumberland Back-to-Back Coal Supply Agreements, the Company is required to purchase and sell 2,681 and 2,615 tons of coal in 2021 and 2022 totaling $104,051 and $101,990, respectively. For the year ended December 31, 2020, the Company purchased and sold 104 tons, totaling $3,997 under the Cumberland Back-to-Back Coal Supply Agreements.

Former PRB operations

On December 8, 2017, the Company closed a transaction (“PRB Transaction”) with Blackjewel L.L.C. (“Blackjewel” or the “Buyer”) to sell its Eagle Butte and Belle Ayr mines located in Wyoming (the “Western Mines” or “Western Assets”). On July 1, 2019, prior to the transfer of the permits, Blackjewel announced that it and certain affiliated entities had filed voluntary petitions for relief under Chapter 11 of the Bankruptcy Code in the United States Bankruptcy Court for the Southern District of West Virginia (the “Bankruptcy Court”). As the mine permit transfer process relating to the Company’s sale of the Western Assets to Blackjewel had not been completed prior to Blackjewel’s filing for Chapter 11 bankruptcy protection, the Company remained the permit holder in good standing for both mines and maintained surety bonding to cover related reclamation and other obligations. The Company remeasured the asset retirement obligations based on the expectation that the mining permits would not transfer and that Blackjewel would not perform on its contractual obligation to reclaim the properties due to the bankruptcy filing. The increase in the asset retirement obligation of $145,913 was expensed within depreciation, depletion, and amortization within discontinued operations in the Consolidated Statements of Operations during the year ended December 31, 2019 as the Company no longer owned the underlying mining assets.

On October 4, 2019, the Bankruptcy Court entered an order approving the sale by Blackjewel of the Western Assets to Eagle Specialty Materials (“ESM”), an affiliate of FM Coal, LLC (“FM Coal”). The closing of the ESM acquisition occurred on October 18, 2019 (the “ESM Transaction”). In connection with the ESM Transaction, the Company and ESM finalized an agreement which provided, among other items, for the transfer of the Western Asset permits from the Company to ESM once certain approvals for their transfer have been obtained and for the assumption by ESM of the related reclamation obligations. Additionally, the surety bonding previously maintained by the Company for the benefit of the Wyoming Department of Environmental Quality (“DEQ”) was released and replaced with substitute surety bonds arranged for by ESM. Lastly, ESM agreed to indemnify the Company and its affiliates against all reclamation liabilities related to the Western Assets and against claims by the federal government, the State of Wyoming, or Campbell County, Wyoming for royalties, ad valorem taxes, and other amounts relating to the Western Assets for the period beginning on December 8, 2017.

The following table presents the details of the ESM Transaction:
Year Ended December 31, 2019
Cash$90,000 
DIP obligation (1)
3,008 
Other331 
Total consideration$93,339 
ARO liabilities transferred(152,882)
Gain on sale (2)
$(59,543)
(1) The Company paid certain Blackjewel debtor-in-possession lenders $3,008 of principal and interest pursuant to an existing agreement between the Company and those lenders.
(2) The Company recorded a $59,543 gain within depreciation, depletion, and amortization within discontinued operations in the Consolidated Statements of Operations during the year ended December 31, 2019 as a result of the reduction of the reclamation obligation partially offset by the consideration paid.

Additionally, in connection with the closing of the ESM Transaction, the Company paid $13,500 to Campbell County, Wyoming for accrued ad valorem back taxes for 2018 and was released from all claims related thereto. Pursuant to an agreement with ESM, the State of Wyoming Department of Revenue, and Blackjewel, the State of Wyoming Department of Revenue released the Company from any outstanding claims related to state tax obligations arising from or related to the Western Mines for any period through and including the closing date of the transaction.

On May 29, 2020, certain subsidiaries of the Company (Contura Coal West, LLC and Contura Wyoming Land, LLC), one of which held the mining permits for the Western Mines, were merged with certain subsidiaries of ESM to become wholly-owned subsidiaries of ESM and to complete the permit transfer process in connection with the ESM Transaction. Pursuant to terms of the transaction, the Company received from ESM approximately $625 in consideration for assets owned by Contura
Coal West, LLC but not previously conveyed.

In connection with the PRB Transaction, the Company entered into certain agreements with Blackjewel under which Blackjewel would sell to the Company all of the coal that the Company was obligated to sell to customers under Western Mines coal supply agreements (“Western Mines CSAs”) which existed as of the transaction closing date but did not transfer to Blackjewel at closing (each, a “PRB Back-to-Back Coal Supply Agreement”). The original PRB Back-to-Back Coal Supply Agreements were not assumed in connection with the ESM Transaction. Instead, the Company entered into new back-to-back coal supply agreements with Bluegrass Commodities LP, the sales and marketing agent for ESM, whereby the Company agreed to purchase and pay for, all coal that the Company is obligated to supply, deliver and sell under the Company’s PRB coal supply agreements that were still in effect as of the closing date of the ESM Transaction. Each PRB Back-to-Back Coal Supply Agreement had economic terms identical to, but offsetting, the related Western Mines CSA. As the Company did not control the purchased coal prior to customer delivery, the Company recorded coal purchases and sales under the related agreements on a net basis. Per terms of the PRB Back-to-Back Coal Supply Agreements, the Company purchased and sold 1,149 tons of coal totaling $11,682 for the year ended December 31, 2020. For the year ended December 31, 2019, the Company purchased and sold 929 tons, totaling $9,941 under the PRB Back-to-Back Coal Supply Agreements. As of December 31, 2020, the PRB Back-to-Back Coal Supply Agreements were expired.

Major Financial Statement Components of Discontinued Operations

The major components of net loss from discontinued operations before income taxes in the Consolidated Statements of Operations are as follows:
Year Ended December 31,
 
2020 (1)
2019
Revenues: 
Total revenues$235,509 $289,206 
Costs and expenses:
Cost of coal sales (exclusive of items shown separately below)215,390 256,336 
Depreciation, depletion and amortization (2)
11,570 99,405 
Accretion on asset retirement obligations (3)
4,154 9,894 
Asset impairment and restructuring (4)
172,640 17,161 
Selling, general and administrative expenses (5)
1,623 4,349 
Other (income) expenses(926)4,742 
Other non-major expense items, net374 2,504 
Loss on sale36,113 — 
Loss from discontinued operations before income taxes$(205,429)$(105,185)
(1) For the year ended December 31, 2020, discontinued operations consisted entirely of activity related to the former NAPP operations.
(2) During the year ended December 31, 2019, depreciation, depletion and amortization includes $145,913 related to an increase in the Company’s estimate of its PRB asset retirement obligations which was partially offset by ($59,543) as a result of the ESM transaction. Refer to the disclosures above for details.
(3) For the year ended December 31, 2019, the former PRB operations’ accretion on asset retirement obligations of $5,961 related to the asset retirement obligations recorded as a result of the Blackjewel bankruptcy filing. Refer to the disclosures above for details.
(4) Refer to Note 8.
(5) Represents professional and legal fees.

Refer to Note 6 for net loss per share information related to discontinued operations.

The major components of assets and liabilities that are classified as discontinued operations in the Consolidated Balance Sheets are as follows:
December 31,
2020
2019
Assets:  
Trade accounts receivable, net of allowance for doubtful accounts$7,504 $20,493 
Inventory, net$— $11,771 
Prepaid expenses and other current assets$3,431 $13,628 
Property, plant, and equipment, net of accumulated depreciation and amortization$— $146,864 
Other non-current assets$9,473 $15,760 
Liabilities:  
Trade accounts payable, accrued expenses and other current liabilities$7,433 $24,769 
Asset retirement obligations$— $21,568 
Workers’ compensation and black lung obligations$32,672 $36,149 
Other non-current liabilities$1,291 $4,593 

The major components of cash flows related to discontinued operations were as follows:
Year Ended December 31,
20202019
Depreciation, depletion and amortization$11,570 $99,405 
Capital expenditures$34,411 $31,964 
Other significant operating non-cash items related to discontinued operations:
Accretion on asset retirement obligations$4,154 $9,894 
Asset impairment and restructuring$172,640 $17,161 
v3.20.4
Revenue
 12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Disaggregation of Revenue from Contracts with Customers

ASC 606 requires that entities disclose disaggregated revenue information in categories (such as type of good or service, geography, market, type of contract, etc.) that depict how the nature, amount, timing, and uncertainty of revenue and cash flow are affected by economic factors. ASC 606 explains that the extent to which an entity’s revenue is disaggregated depends on the facts and circumstances that pertain to the entity’s contracts with customers and that some entities may need to use more than one type of category to meet the objective for disaggregating revenue.

The Company earns revenues primarily through the sale of coal produced at Company operations and coal purchased from third parties. The Company extracts, processes and markets met and thermal coal from deep and surface mines for sale to steel and coke producers, industrial customers, and electric utilities. The Company conducts mining operations only in the United States with mines in Central Appalachia. The Company has two reportable segments: Met and CAPP - Thermal. In addition to the two reportable segments, the All Other category includes general corporate overhead and corporate assets and liabilities, the elimination of certain intercompany activity, and the Company’s discontinued operations. Refer to Note 25 for further segment information.

The following tables disaggregate the Company’s coal revenues by product category and by market to depict how the nature, amount, timing, and uncertainty of the Company’s coal revenues and cash flows are affected by economic factors:
Year Ended December 31, 2020
Met CoalThermal CoalTotal
Export coal revenues$870,121 $27,904 $898,025 
Domestic coal revenues362,654 152,445 515,099 
Total coal revenues$1,232,775 $180,349 $1,413,124 
Year Ended December 31, 2019
Met CoalThermal CoalTotal
Export coal revenues$1,174,942 $48,166 $1,223,108 
Domestic coal revenues551,806 221,020 772,826 
Total coal revenues$1,726,748 $269,186 $1,995,934 
Performance Obligations

The Company considers each individual transfer of coal on a per shipment basis to the customer a performance obligation. The pricing terms of the Company’s contracts with customers include fixed pricing, variable pricing, or a combination of both fixed and variable pricing. All the Company’s revenue derived from contracts with customers is recognized at a point in time. The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied as of December 31, 2020.
20212022202320242025Total
Estimated coal revenues (1)
$113,676 $28,000 $— $— $— $141,676 
(1) Amounts only include estimated coal revenues associated with contracts with customers with fixed pricing with original expected duration of more than one year. The Company has elected not to disclose the aggregate amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period for performance obligations with either of the following conditions: 1) the remaining performance obligation is part of a contract that has an original expected duration of one year or less; or 2) the remaining performance obligation has variable consideration that is allocated entirely to a wholly unsatisfied performance obligation.
v3.20.4
Accumulated Other Comprehensive (Loss) Income
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive Loss
The following tables summarize the changes to accumulated other comprehensive loss during the years ended December 31, 2020 and 2019:
Balance January 1, 2020Other comprehensive loss before reclassificationsAmounts reclassified from accumulated other comprehensive lossBalance December 31, 2020
Employee benefit costs$(58,616)$(60,647)$7,278 $(111,985)
Balance January 1, 2019
Other comprehensive loss before reclassificationsAmounts reclassified from accumulated other comprehensive loss
Balance December 31, 2019
Employee benefit costs$(23,130)$(42,891)$7,405 $(58,616)

The following table summarizes the amounts reclassified from accumulated other comprehensive loss and the Consolidated Statements of Operations line items affected by the reclassification during the years ended December 31, 2020 and 2019:
Details about accumulated other comprehensive loss componentsAmounts reclassified from accumulated other comprehensive lossAffected line item in the Consolidated Statements of Operations
Year Ended December 31,
20202019
Employee benefit costs:
Amortization of actuarial loss (1)
$3,929 $959 
Miscellaneous loss, net
Settlement (1)
3,349 6,446 
Miscellaneous loss, net
Total before income tax$7,278 $7,405 
Income tax— — Income tax benefit
Total, net of income tax$7,278 $7,405 
(1) These accumulated other comprehensive loss components are included in the computation of net periodic benefit costs for certain employee benefit plans. Refer to Note 20.
v3.20.4
Net Loss per Share
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Net Loss per Share Net Loss per Share
The number of shares used to calculate basic net loss per common share is based on the weighted average number of the Company’s outstanding common shares during the respective period. The number of shares used to calculate diluted net loss per common share is based on the number of common shares used to calculate basic net loss per common share plus the dilutive effect of stock options and other stock-based instruments held by the Company’s employees and directors during the period, and the Company’s outstanding Series A warrants. The diluted effect of outstanding stock-based instruments is determined by application of the treasury stock method. The warrants become dilutive for diluted net loss per common share calculations when the market price of the Company’s common stock exceeds the exercise price. Dilutive securities are not included in the computation of diluted net loss per common share as the impact would be anti-dilutive. Refer to the Consolidated Statements of Operations for net loss per common share for the years ended December 31, 2020 and 2019.
For the years ended December 31, 2020 and 2019, 1,317,351 and 537,918 warrants, stock options, and other stock-based instruments, respectively, were excluded from the computation of dilutive net loss per share because they would have been anti-dilutive. When applying the treasury stock method, anti-dilution generally occurs when the exercise prices or unrecognized compensation cost per share are higher than the Company’s average stock price during an applicable period.
Anti-dilution also occurs in periods of a net loss, and the dilutive impact of all share-based compensation awards are excluded. For the years ended December 31, 2020 and 2019, the weighted average share impact of warrants, stock options, and other stock-based instruments that were excluded from the calculation of diluted shares due to the Company incurring a net loss for the period were 142,250 and 256,668, respectively.
v3.20.4
Inventories, net
 12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Inventories, net Inventories, net
Inventories, net consisted of the following: 
December 31,
 20202019
Raw coal$15,084 $26,584 
Saleable coal69,262 100,275 
Materials, supplies and other, net (1)
23,705 24,029 
Total inventories, net$108,051 $150,888 
(1) Includes an increase in allowance for obsolete material and supplies inventory of $807 recorded as restructuring expense during the year ended December 31, 2020 (refer to Note 8).
v3.20.4
Asset Impairment and Restructuring
 12 Months Ended
Dec. 31, 2020
Restructuring and Related Activities [Abstract]  
Asset Impairment and Restructuring Asset Impairment and RestructuringLong-lived Asset Impairment for the Year Ended December 31, 2020
During the year ended December 31, 2020, weakening coal market conditions due in part to the impact of the global COVID-19 Pandemic, as well as the following events resulted in quarterly impairment testing:

•During the second quarter of 2020, the Company announced that it would take certain strategic actions with respect to two of its thermal coal mining complexes in an effort to strengthen its financial performance and improve forecasted liquidity. The Company announced that an underground mine and preparation plant located in West Virginia would be idled during the third quarter of 2020. In addition, the Company decided not to move forward with the construction of a new refuse impoundment at its Cumberland mine in Pennsylvania and would therefore no longer spend the significant capital required in connection with the project. As a result, the Cumberland mine was expected to cease production by the end of 2022. On December 10, 2020, the Company sold its Cumberland mining operations. Refer to Note 3 for further details.

•During the fourth quarter of 2020, changes in mine plans and the determination that certain mineral reserves previously forecasted to be mined were no longer considered economic due to poor geologic conditions reduced forecasted cash flows for one Met and one CAPP - Thermal asset group to amounts below those required for full recoverability.

The Company performed long-lived asset impairment tests as of November 30, 2020, August 31, 2020, May 31, 2020, and February 29, 2020. In total, the Company determined that indicators of impairment with respect to five long-lived asset groups within its Met reporting segment, three long-lived asset groups within its CAPP - Thermal reporting segment, and one long-lived asset group within discontinued operations existed during the year ended December 31, 2020.

The following tables present the details of the long-lived asset impairments during the year ended December 31, 2020:

Year Ended December 31, 2020
First QuarterSecond QuarterThird QuarterFourth QuarterYear Ended
Continuing operations:
Met
$32,951 $— $— $13,366 $46,317 
CAPP - Thermal
758 17,385 219 16,270 34,632 
All Other— 5 — — 5 
Total from continuing operations$33,709 $17,390 $219 $29,636 $80,954 
Discontinued operations:$— $144,348 $3,297 $— $147,645 
Total long-lived asset impairment:$33,709 $161,738 $3,516 $29,636 $228,599 
Year Ended December 31, 2020
First QuarterSecond QuarterThird QuarterFourth QuarterYear Ended
Continuing operations:
Mineral rights, net
$21,825 $2,241 $— $17,513 $41,579 
Property, plant, and equipment, net
6,066 6,496 219 5,450 $18,231 
Acquired mine permits, net5,818 8,653 — 6,673 $21,144 
Total from continuing operations$33,709 $17,390 $219 $29,636 $80,954 
Discontinued operations:
Mineral rights, net
$— $16,364 $— $— $16,364 
Property, plant, and equipment, net
— 127,984 3,297 — $131,281 
Total from discontinued operations$— $144,348 $3,297 $— $147,645 
Total long-lived asset impairment:
Mineral rights, net
$21,825 $18,605 $— $17,513 $57,943 
Property, plant, and equipment, net
6,066 134,480 3,516 5,450 149,512 
Acquired mine permits, net5,818 8,653 — 6,673 21,144 
Total long-lived asset impairment$33,709 $161,738 $3,516 $29,636 $228,599 

Long-lived Asset Impairment for the Year Ended December 31, 2019

During the year ended December 31, 2019, the Company determined that indicators of impairment were present for three long-lived asset groups within each of its Met and CAPP - Thermal reporting segments and performed impairment testing as of December 31, 2019. At December 31, 2019, the Company determined that the carrying amounts of the asset groups exceeded both their undiscounted cash flows and their estimated fair values. As a result, after allocating the potential impairment to individual assets, the Company recorded a long-lived asset impairment of $60,169, of which $9,176 was recorded within Met and $50,993 was recorded within CAPP - Thermal within continuing operations of the Consolidated Statements of Operations. The long-lived asset impairment reduced the carrying values of mineral rights by $35,445, property, plant, and equipment, net, by $17,056, acquired mine permits, net, by $5,997, and long-lived assets related to asset retirement obligations by $1,671.

Additionally, during the year ended December 31, 2019, the Company recorded an asset impairment of $6,155 within continuing operations of the Consolidated Statements of Operations primarily related to the write-off of prepaid purchased coal as a result of Blackjewel’s Chapter 11 bankruptcy filing on July 1, 2019. During the year ended December 31, 2019, the Company also recorded an asset impairment of $17,161 within discontinued operations of the Consolidated Statements of Operations which was primarily related to the write-off of tax related indemnification receivables within the former PRB operations. The Company was considered to be the primary obligor for certain taxes that Blackjewel was contractually obligated to pay. During the year ended December 31, 2019, the Company recorded an impairment charge for the offsetting receivable form Blackjewel as a result of the Blackjewel bankruptcy filing. Refer to Note 3 for further information.

Restructuring

As a result of the strategic actions discussed above, the Company recorded restructuring expense during the year ended December 31, 2020 as follows:
Year Ended December 31, 2020
Total Restructuring
Continuing Operations (3)
Discontinued Operations
Severance and employee-related benefits (1)
$26,037 $2,117 $23,920 
Other costs (2)
1,882 807 1,075 
Total restructuring expense$27,919 $2,924 $24,995 
(1) Severance and employee-related benefits were considered probable and estimable based on provisions of contractual agreements and existing employee benefit plans.
(2) The year ended December 31, 2020 includes accelerated amortization of deferred longwall move expenses of $668, allowance for advanced mining royalties of $407, and allowance for obsolete materials and supplies inventory of $807.
(3) During the year ended December 31, 2020, total restructuring expenses of $2,087 and $837 were recorded within the reportable segments CAPP - Thermal and All Other, respectively. The total restructuring expenses of $2,924 affected Accrued expenses and other current liabilities, Other non-current liabilities, inventories, net, and Other non-current assets.

There were no restructuring expenses recorded during the year ended December 31, 2019.
v3.20.4
Prepaid Expenses and Other Current Assets
 12 Months Ended
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaid Expense and Other Current Assets Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following:
December 31,
 20202019
Prepaid freight$8,515 $8,268 
Notes and other receivables13,245 8,447 
Short-term restricted cash9,311 12,363 
Short-term deposits47 689 
Prepaid insurance6,510 9,591 
Refundable income taxes64,565 33,915 
Prepaid bond premium2,576 2,454 
Other prepaid expenses1,483 1,996 
Total prepaid expenses and other current assets$106,252 $77,723 
v3.20.4
Property, Plant, and Equipment, Net
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment, Net Property, Plant, and Equipment, net
Property, plant, and equipment, net, consisted of the following: 
December 31,
 20202019
Plant and mining equipment$603,463 $600,495 
Mine development96,008 36,721 
Land26,606 30,506 
Office equipment, software and other1,379 1,396 
Construction in progress18,587 23,658 
Total property, equipment and mine development costs746,043 692,776 
Less accumulated depreciation, depletion and amortization382,423 256,378 
Total property, plant, and equipment, net$363,620 $436,398 
Included in plant and mining equipment are assets under financing leases totaling $7,907 and $14,328 with accumulated depreciation of $3,645 and $4,641 as of December 31, 2020 and December 31, 2019, respectively.
Depreciation and amortization expense associated with property, plant, equipment, and non-mineral asset retirement obligation assets, net, was $153,631 and $201,206 for the years ended December 31, 2020 and 2019, respectively.

Depreciation expense for the years ended December 31, 2020 and 2019 includes a credit of ($3,689) and ($1,522), respectively, related to revisions to asset retirement obligations. Refer to Note 17 for further disclosures related to asset retirement obligations.
During the years ended December 31, 2020 and 2019, the Company recorded long-lived asset impairments which reduced the carrying value of property, plant, and equipment, net, by $18,231 and $17,056, respectively. Refer to Note 8 for further information. As of December 31, 2020, the Company had commitments to purchase approximately $5,008 and $170 of new equipment, expected to be acquired at various dates in 2021 and 2023, respectively.
v3.20.4
Other Non-Current Assets
 12 Months Ended
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Non-Current Assets Other Non-Current Assets
Other non-current assets consisted of the following:
December 31,
 20202019
Operating lease right-of-use assets$5,671 $7,298 
Long-term deposits28,200 9,621 
Long-term restricted investments23,768 19,399 
Equity method investments18,383 18,413 
Federal income tax receivable— 64,160 
Workers’ compensation receivables48,320 52,757 
Other25,040 17,827 
Total other non-current assets$149,382 $189,475 
v3.20.4
Leases
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Leases Leases
The Company’s lease population consists primarily of vehicle and heavy equipment leases and leases for office equipment. The Company’s building and land leases relate to corporate office space and certain site offices. The Company determines whether a contract contains a lease based on whether the Company obtains the right to control the use of specifically identifiable property, plant, and equipment for a period of time in exchange for consideration. For the years ended December 31, 2020 and 2019, the Company identified no instances requiring significant judgment in determining whether any contracts entered into during the period were or were not leases. Additionally, the Company had no material sublease agreements within the scope of ASC 842 or lease agreements for which the Company was the lessor for the years ended December 31, 2020 and 2019.

Renewal options in the Company’s lease population primarily relate to month-to-month extensions on vehicle leases and are immaterial both individually and in the aggregate. The Company includes renewal options that are reasonably certain to be exercised in the measurement of lease liabilities. As of December 31, 2020, the Company does not intend to exercise any termination options on existing leases.

As of December 31, 2020 and 2019, the Company had the following right-of-use assets and lease liabilities within the Company’s Consolidated Balance Sheets:
December 31, 2020December 31, 2019
AssetsBalance Sheet Classification
Financing lease assetsProperty, plant, and equipment, net$4,262 $9,687 
Operating lease right-of-use assetsOther non-current assets5,671 7,298 
Total lease assets$9,933 $16,985 
LiabilitiesBalance Sheet Classification
Financing lease liabilities - currentCurrent portion of long-term debt$2,014 $3,266 
Operating lease liabilities - currentAccrued expenses and other current liabilities595 1,402 
Financing lease liabilities - long-termLong-term debt1,996 4,651 
Operating lease liabilities - long-termOther non-current liabilities5,076 5,896 
Total lease liabilities$9,681 $15,215 

Total lease costs and other lease information for the years ended December 31, 2020 and 2019 included the following:
Year Ended December 31, 2020Year Ended December 31, 2019
Lease cost (1)
Financing lease cost:
     Amortization of leased assets$3,238 $3,738 
     Interest on lease liabilities358 477 
Operating lease cost2,105 2,389 
Short-term lease cost1,518 1,851 
     Total lease cost$7,219 $8,455 
(1) The Company had no variable lease costs or sublease income for the years ended December 31, 2020 and 2019.

Year Ended December 31, 2020Year Ended December 31, 2019
Other information
Cash paid for amounts included in the measurement of lease liabilities$7,157 $8,349 
     Operating cash flows from financing leases$358 $463 
     Operating cash flows from operating leases$3,623 $4,240 
     Financing cash flows from financing leases$3,176 $3,646 
Right-of-use assets obtained in exchange for new financing lease liabilities$221 $1,429 
Right-of-use assets obtained in exchange for new operating lease liabilities$(12)$371 
Lease Term and Discount Rate
Weighted-average remaining lease term in months - financing leases23.333.7
Weighted-average remaining lease term in months - operating leases101.4105.1
Weighted-average discount rate - financing leases6.1 %5.4 %
Weighted-average discount rate - operating leases11.5 %11.4 %

The Company has elected to show net instead of gross amounts for right-of-use assets and liabilities within its Consolidated Statements of Cash Flows.

The following table summarizes the maturity of the Company’s lease liabilities on an undiscounted cash flow basis and a reconciliation to the lease liabilities recognized in the Company’s Consolidated Balance Sheet as of December 31, 2020:
Financing LeasesOperating Leases
Lease cost
2021$2,210 $1,210 
20221,827 1,076 
2023269 1,101 
20246 982 
2025— 897 
Thereafter— 4,018 
Total future minimum lease payments$4,312 $9,284 
Imputed interest(302)(3,613)
Present value of future minimum lease payments$4,010 $5,671 
As of December 31, 2020, the Company had no leases with future commencement dates that will create significant rights or obligations for the Company.
Leases Leases
The Company’s lease population consists primarily of vehicle and heavy equipment leases and leases for office equipment. The Company’s building and land leases relate to corporate office space and certain site offices. The Company determines whether a contract contains a lease based on whether the Company obtains the right to control the use of specifically identifiable property, plant, and equipment for a period of time in exchange for consideration. For the years ended December 31, 2020 and 2019, the Company identified no instances requiring significant judgment in determining whether any contracts entered into during the period were or were not leases. Additionally, the Company had no material sublease agreements within the scope of ASC 842 or lease agreements for which the Company was the lessor for the years ended December 31, 2020 and 2019.

Renewal options in the Company’s lease population primarily relate to month-to-month extensions on vehicle leases and are immaterial both individually and in the aggregate. The Company includes renewal options that are reasonably certain to be exercised in the measurement of lease liabilities. As of December 31, 2020, the Company does not intend to exercise any termination options on existing leases.

As of December 31, 2020 and 2019, the Company had the following right-of-use assets and lease liabilities within the Company’s Consolidated Balance Sheets:
December 31, 2020December 31, 2019
AssetsBalance Sheet Classification
Financing lease assetsProperty, plant, and equipment, net$4,262 $9,687 
Operating lease right-of-use assetsOther non-current assets5,671 7,298 
Total lease assets$9,933 $16,985 
LiabilitiesBalance Sheet Classification
Financing lease liabilities - currentCurrent portion of long-term debt$2,014 $3,266 
Operating lease liabilities - currentAccrued expenses and other current liabilities595 1,402 
Financing lease liabilities - long-termLong-term debt1,996 4,651 
Operating lease liabilities - long-termOther non-current liabilities5,076 5,896 
Total lease liabilities$9,681 $15,215 

Total lease costs and other lease information for the years ended December 31, 2020 and 2019 included the following:
Year Ended December 31, 2020Year Ended December 31, 2019
Lease cost (1)
Financing lease cost:
     Amortization of leased assets$3,238 $3,738 
     Interest on lease liabilities358 477 
Operating lease cost2,105 2,389 
Short-term lease cost1,518 1,851 
     Total lease cost$7,219 $8,455 
(1) The Company had no variable lease costs or sublease income for the years ended December 31, 2020 and 2019.

Year Ended December 31, 2020Year Ended December 31, 2019
Other information
Cash paid for amounts included in the measurement of lease liabilities$7,157 $8,349 
     Operating cash flows from financing leases$358 $463 
     Operating cash flows from operating leases$3,623 $4,240 
     Financing cash flows from financing leases$3,176 $3,646 
Right-of-use assets obtained in exchange for new financing lease liabilities$221 $1,429 
Right-of-use assets obtained in exchange for new operating lease liabilities$(12)$371 
Lease Term and Discount Rate
Weighted-average remaining lease term in months - financing leases23.333.7
Weighted-average remaining lease term in months - operating leases101.4105.1
Weighted-average discount rate - financing leases6.1 %5.4 %
Weighted-average discount rate - operating leases11.5 %11.4 %

The Company has elected to show net instead of gross amounts for right-of-use assets and liabilities within its Consolidated Statements of Cash Flows.

The following table summarizes the maturity of the Company’s lease liabilities on an undiscounted cash flow basis and a reconciliation to the lease liabilities recognized in the Company’s Consolidated Balance Sheet as of December 31, 2020:
Financing LeasesOperating Leases
Lease cost
2021$2,210 $1,210 
20221,827 1,076 
2023269 1,101 
20246 982 
2025— 897 
Thereafter— 4,018 
Total future minimum lease payments$4,312 $9,284 
Imputed interest(302)(3,613)
Present value of future minimum lease payments$4,010 $5,671 
As of December 31, 2020, the Company had no leases with future commencement dates that will create significant rights or obligations for the Company.
v3.20.4
Stock Repurchases and Dividend
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Stock Repurchase and Dividend Stock Repurchases
In May 2019, the Company’s Board of Directors adopted a capital return program that permits the Company to return to stockholders up to an aggregate amount of $250,000 of capital. The capital return program does not have a fixed expiration date and returns of capital may take the form of share repurchases, dividends or a combination thereof. Any share repurchases may be made from time to time through open market transactions, block trades, privately negotiated transactions, tender offers, or otherwise. Any returns of capital under the program will be at the discretion of the Company’s Board of Directors and are subject to market and business conditions, levels of available liquidity, the Company’s cash needs, restrictions under agreements or obligations, legal or regulatory requirements or restrictions, and other relevant factors.

On August 29, 2019, the Company announced that its Board of Directors had approved a stock repurchase plan (the “Company Repurchase Plan”) to acquire up to $100,000 in the aggregate of the Company’s common stock at prices as set forth in such plan over a specified period. Through September 30, 2019, the Company had repurchased an aggregate of 529,303 shares of common stock under the Company Repurchase Plan for an aggregate purchase price of $15,969 (comprised of $15,953 of share repurchases and $16 of related fees) for an average price paid per share of $30.17. As of October 1, 2019, the Company suspended the Company Repurchase Plan.
Additionally, on September 12, 2019, the Company entered into a common stock repurchase agreement with Whitebox Multi-Strategy Partners, L.P., Whitebox Asymmetric Partners, L.P., Whitebox Credit Partners, L.P. and Whitebox Institutional Partners, L.P. (together, “Whitebox”). Pursuant to terms of the common stock repurchase agreement, the Company repurchased an aggregate of 500,000 shares of common stock from Whitebox at $32.99 per share for an aggregate purchase price of $16,495.
v3.20.4
Accrued Expenses and Other Current Liabilities
 12 Months Ended
Dec. 31, 2020
Payables and Accruals [Abstract]  
Accrued Expenses and Other Current Liabilities Accrued Expenses and Other Current Liabilities
Accrued expenses and other current liabilities consisted of the following: 
December 31,
 20202019
Wages and benefits$40,330 $37,983 
Workers’ compensation 10,355 11,317 
Black lung 6,784 7,409 
Taxes other than income taxes21,540 24,662 
Current portion of asset retirement obligations24,990 38,731 
Accrued interest and fees15,902 4,362 
Deferred revenue13,197 — 
Freight accrual2,610 5,851 
Other 4,698 9,164 
Total accrued expenses and other current liabilities$140,406 $139,479 
v3.20.4
Long-Term Debt
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Long-Term Debt Long-Term Debt
Long-term debt consisted of the following: 
December 31,
 20202019
Term Loan Credit Facility - due June 2024$553,373 $558,991 
ABL Facility - due April 20223,350 — 
LCC Note Payable27,500 45,000 
LCC Water Treatment Obligation6,875 9,375 
Other (1)
8,475 9,263 
Debt discount and issuance costs(17,046)(29,695)
Total long-term debt 582,527 592,934 
Less current portion(28,830)(28,476)
Long-term debt, net of current portion$553,697 $564,458 
(1) Includes financing leases, refer to Note 12 for additional information.

Term Loan Credit Facility - due June 2024
On June 14, 2019, the Company entered into a Credit Agreement with Cantor Fitzgerald Securities, as administrative agent and collateral agent, and the other lenders party thereto (as defined therein) that provides for a senior secured term loan facility in the aggregate principal amount of $561,800 with a maturity date of June 14, 2024 (the “Term Loan Credit Facility”). Principal repayments equal to approximately $1,405 are due each March, June, September and December (commencing with September 30, 2019) with the final principal repayment installment repaid on the maturity date and in an amount equal to the aggregate principal amount outstanding on such date. The Term Loan Credit Facility bears an interest rate per annum based on the character of the loan (defined as either “Base Rate Loan” or “Eurocurrency Rate Loan”). Each loan type bears interest at a rate per annum comprised of a base rate (as defined) plus an applicable percentage (6.00% for Base Rate Loans and 7.00% for Eurocurrency Rate Loans on or prior to the second anniversary of the Closing Date and 7.00% or 8.00% thereafter (the “Applicable Rate”)). The Eurocurrency base rate is subject to a 2.00% floor. Interest accrued on each Base Rate Loan is payable in arrears on the last business day of each March, June, September and December and the maturity date. Interest accrued on each Eurocurrency Rate Loan is payable in arrears on the last day of each interest period as defined therein. As of December 31, 2020, the borrowings made under the Term Loan Credit Facility were comprised of Eurocurrency Rate Loans with an interest rate of 9.00%, calculated as the Eurocurrency rate during the period plus an applicable rate of 7.00%. As of December 31, 2020, the carrying value of the Term Loan Credit Facility was $540,643, with $5,618 classified as current, within the Consolidated
Balance Sheets. As of December 31, 2019, the carrying value of the term loan credit facility was $538,765, with $5,618 classified as current, within the Consolidated Balance Sheets.

The Term Loan Credit Facility was provided primarily by certain of the Company’s existing shareholders (related parties) as of the agreement date. As such, the Company analyzed various factors of the transaction and concluded the Term Loan Credit Facility was issued at a reasonable market rate and therefore considered to be an arm’s length transaction.

The Company used the proceeds from the Term Loan Credit Facility to repay the outstanding principal balance of $543,125 under the Amended and Restated Credit Agreement dated November 9, 2018 and fees related to such refinancing. The Company recorded a loss on modification of debt of $255, primarily related to modification fees paid under the refinance, and a loss on extinguishment of debt of $26,204, primarily related to the write-off of outstanding debt discounts and unamortized debt issuance costs under the Amended and Restated Credit Agreement dated November 9, 2018, which are recorded in loss on modification and extinguishment of debt within the Consolidated Statements of Operations for the year ended December 31, 2019.

All obligations under the Term Loan Credit Facility are guaranteed by substantially all of Alpha’s direct and indirect subsidiaries. Certain obligations under the Term Loan Facility are secured by a senior lien, subject to certain exceptions (including the ABL Priority Collateral described below), by substantially all of Alpha’s assets and the assets of Alpha’s subsidiary guarantors (“Term Loan Priority Collateral”), in each case subject to exceptions. The obligations under the Term Loan Credit Facility are also secured by a junior lien, again subject to certain exceptions, against the ABL Priority Collateral. The Term Loan Facility contains negative and affirmative covenants including certain financial covenants that are more flexible than the covenants on the Amended and Restated Credit Agreement dated November 9, 2018. The Company was in compliance with all covenants under this agreement as of December 31, 2020.

Amended and Restated Asset-Based Revolving Credit Agreement

On November 9, 2018, the Company entered into the Amended and Restated Asset-Based Revolving Credit Agreement with Citibank N.A. as administrative agent, collateral agent, and swingline lender and the other lenders party thereto (the “Lenders”), and Citibank N.A., Barclays Bank PLC, BMO Harris Bank N.A. and Credit Suisse AG as letter of credit issuers (“LC Lenders”). The Amended and Restated Asset-Based Revolving Credit Agreement amended and restated the Asset-Based Revolving Credit Agreement dated April 3, 2017, in its entirety, and includes a senior secured asset-based revolving credit facility (the “ABL Facility”). Under the ABL Facility, the Company may borrow cash from the Lenders (as defined therein) or cause the L/C Issuers (as defined therein) to issue letters of credit, on a revolving basis, in an aggregate amount of up to $225,000, of which no more than $200,000 may be drawn through letters of credit. Any borrowings under the ABL Facility will have a maturity date of April 3, 2022 and will bear interest based on the character of the loan (defined as either “Base Rate Loan” or “Eurocurrency Rate Loan”) plus an applicable rate ranging from 1.00% to 1.50% for Base Rate Loans and 2.00% to 2.50% for Eurocurrency Rate Loans, depending on the amount of credit available. Pursuant to terms of the Amended and Restated Asset-Based Revolving Credit Agreement at each notice period, the Company elects the character of the loan, the interest period, and may provide notice of continuation or conversion of the borrowed principal amount with the ability to repay the borrowed principal amount in advance of the maturity date without penalty. The Amended and Restated Asset-Based Revolving Credit Agreement provides that a specified percentage of billed, unbilled and approved foreign receivables and raw and clean inventory meeting certain criteria are eligible to be counted for purposes of collateralizing the amount of financing available, subject to certain terms and conditions. Availability under the ABL Facility is calculated on a monthly basis and fluctuates based on qualifying amounts of coal inventory and trade accounts receivable (the “Borrowing Base”) and the facility's covenant limitations related to the Fixed Charge Coverage Ratio (as defined in therein). In accordance with terms of the ABL Facility, the Company may be required to collateralize the ABL Facility to the extent outstanding borrowings and letters of credit under the ABL Facility exceed the Borrowing Base after considering covenant limitations. Due to fluctuations of the Borrowing Base, the Company was required to post $25,000 of collateral in January 2021 to remain in compliance with the terms of the ABL Facility as of December 31, 2020.
On March 20, 2020, the Company borrowed $57,500 principal amount under the ABL Facility. The funds were borrowed to augment the Company’s short-term operational flexibility in the face of uncertainty created by the current spread of the COVID-19 virus and its potential effects (see further discussion in Note 1). As of December 31, 2020, the borrowings made under the ABL Facility were comprised of Eurocurrency Rate Loans with an interest rate of 2.73%, calculated as the Eurocurrency rate during the period plus an applicable rate of 2.50%. The interest rate is subject to periodic adjustment and is subject to adjustment again on April 7, 2021. As of December 31, 2020, the carrying value of the ABL Facility was $3,350, all
of which was classified as long-term within the Consolidated Balance Sheets. As of December 31, 2019, the Company had no borrowings under the ABL Facility.
Any letters of credit issued under the ABL Facility will bear a commitment fee rate ranging from 0.25% to 0.375% depending on the amount of availability per terms of the agreement, and a fronting fee of 0.25% of the face amount under each letter of credit, payable to the ABL Facility’s administrative agent. As of December 31, 2020 and December 31, 2019, the Company had $123,108 and $99,876 letters of credit outstanding under the ABL Facility, respectively.
The ABL Facility is guaranteed by substantially all of Alpha’s direct and indirect subsidiaries (together with the Alpha, the “Loan Parties”) and secured by all or substantially all assets of the Loan Parties, including equity in its direct domestic subsidiaries and first-tier foreign subsidiaries, as collateral for the obligations under the ABL Facility. The ABL Facility has a first lien on ABL priority collateral and a second lien on term loan priority collateral. The Amended and Restated Asset-Based Revolving Credit Agreement, as amended, and related documents contain negative and affirmative covenants including certain financial covenants. The Company is in compliance with all covenants under these agreements as of December 31, 2020.

LCC Note Payable

As a result of the Merger, the Company assumed a note payable to Lexington Coal Company (“LCC”) in the aggregate amount of $62,500 (the “LCC Note Payable”) and with a maturity date of July 26, 2022. The LCC Note Payable has no stated interest rate and an imputed interest rate of 12.45%. Principal repayments equal to $17,500 are due each July during 2019, 2020 and 2021, with the final principal payment of $10,000 due on the maturity date. The carrying value of the LCC Note Payable was $24,423 and $37,695, with $17,500 and $17,500 reported within the current portion of long-term debt as of December 31, 2020 and 2019, respectively.

LCC Water Treatment Stipulation

As a result of the Merger, the Company assumed an obligation to contribute $12,500 into Lexington Coal Company’s water treatment restricted cash accounts (the “LCC Water Treatment Stipulation”). Contributions equal to $625 are due each January, April, July and October from 2019 through 2023. The LCC Water Treatment Stipulation has no stated interest rate and an imputed interest rate of 13.12%. The carrying value of the LCC Water Treatment Stipulation was $5,636 and $7,211, with $1,875 and $1,875 reported within the current portion of long-term debt as of December 31, 2020 and 2019, respectively.

Future Maturities

Future maturities of long-term debt as of December 31, 2020 are as follows: 
2021$28,830 
202224,815 
20239,300 
2024536,628 
Total long-term debt$599,573 
v3.20.4
Acquisition-Related Obligations
 12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Acquisition-Related Obligations Acquisition-Related ObligationsAcquisition-related obligations consisted of the following:
December 31,
20202019
Contingent Revenue Obligation$28,967 $52,427 
Environmental Settlement Obligations10,391 16,305 
Reclamation Funding Liability— 12,000 
UMWA Funds Settlement Liability2,000 4,000 
Discount(1,491)(4,834)
Total acquisition-related obligations 39,867 79,898 
Less current portion(19,099)(33,639)
Acquisition-related obligations, net of current portion$20,768 $46,259 

The Company entered into various settlement agreements with Alpha Natural Resources, Inc. and/or the Alpha Natural Resources, Inc. bankruptcy successor ANR, Inc. and third parties as part of the Alpha Natural Resources, Inc. bankruptcy reorganization process. The Company assumed acquisition-related obligations through those settlement agreements which became effective on July 26, 2016, the effective date of Alpha Natural Resources, Inc.’s plan of reorganization. Additionally, as a result of the Merger, the Company assumed certain acquisition-related obligations pursuant to the terms stipulated within the bankruptcy settlement previously entered into by the Merger Companies.

Contingent Revenue Obligation

As a result of the Merger, the Company assumed a contingent revenue payment obligation (the “Contingent Revenue Obligation”) to certain of the Merger Companies’ creditors pursuant to the terms stipulated within the bankruptcy settlement previously entered into by the Merger Companies. Pursuant to terms of the obligation, the annual obligation will be limited to revenues derived from legacy operations for the Merger Companies and will not include revenues related to legacy Alpha Metallurgical Resources, Inc. operations. The Contingent Revenue Obligation consists of a contingent revenue payment of 1.5% of annual gross revenues of the legacy operations for the Merger Companies up to $500,000 and 1.0% of annual gross revenue of the legacy operations for the Merger Companies in excess of $500,000 through the period ended December 31, 2022. As of December 31, 2020 and 2019, the carrying value of the Contingent Revenue Obligation was $28,967 and $52,427, with $11,393 and $14,646 classified as current, respectively, and classified as an acquisition-related obligation in the Consolidated Balance Sheets. Refer to Note 18 for further disclosures related to the fair value assignment and methods used.

During the second quarter of 2020, the Company paid $15,084, including $374 of unclaimed unsecured claims distributions, pursuant to terms of the Contingent Revenue Obligation. During the second quarter of 2019, the Company paid $9,627 pursuant to terms of the Contingent Revenue Obligation.

Environmental Settlement Obligations

As a result of the Merger, the Company assumed certain environmental settlement obligations (the “Environmental Settlement Obligations”) pursuant to the terms stipulated within the bankruptcy settlement previously entered into by the Merger Companies. These obligations include payments to a third-party environmental agency and the funding of certain reclamation related projects through 2022. As of December 31, 2020 and 2019, the carrying value of the Environmental Settlement Obligations was $9,237 and $13,594, net of discounts of $1,154 and $2,711, with $6,044 and $6,185 classified as current, respectively, all of which was classified as an acquisition-related obligation in the Consolidated Balance Sheets.

Reclamation Funding Agreement

Pursuant to the Reclamation Funding Agreement dated July 12, 2016, the Company paid the aggregate amount of $50,000 into the various Restricted Cash Reclamation Accounts as follows: $8,000 immediately upon the effective date of the agreement; $10,000 on the anniversary of the effective date in each of 2017, 2018, and 2019; and $12,000 on the anniversary of the effective date in 2020. As of December 31, 2020, the Company has no remaining payments for the Funding of Restricted Cash Reclamation liability. As of December 31, 2019 the carrying value of the Funding of Restricted Cash Reclamation liability was $10,808, net of discounts of $1,192, all of which was classified as a current acquisition-related obligation in the Consolidated Balance Sheets.
v3.20.4
Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Asset Retirement Obligations
The following table summarizes the changes in asset retirement obligations for the years ended December 31, 2020 and 2019:
Total asset retirement obligations at December 31, 2018$192,038 
Merger measurement-period adjustments12,718 
Accretion for the period (1)
23,852 
Sites added during the period5,112 
Revisions in estimated cash flows (2)
(7,162)
Expenditures for the period(23,421)
Total asset retirement obligations at December 31, 2019$203,137 
Accretion for the period26,504 
Sites added during the period 621 
Revisions in estimated cash flows (2)
(43,765)
Expenditures for the period(21,433)
Total asset retirement obligations at December 31, 2020165,064 
Less current portion (3)
(24,990)
Long-term portion$140,074 
(1)    Amount does not include the accretion related to asset retirement obligations classified as liabilities held for sale.
(2)    The revisions in estimated cash flows resulted primarily from discount rate adjustments and changes in mine plans.
(3)    Included within accrued expenses and other current liabilities on the Company’s Consolidated Balance Sheets. Refer to Note 14.
v3.20.4
Fair Value of Financial Instruments and Fair Value Measurements
 12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments and Fair Value Measurements Fair Value of Financial Instruments and Fair Value Measurements
The estimated fair values of financial instruments are determined based on relevant market information. These estimates involve uncertainty and cannot be determined with precision.
The carrying amounts for cash and cash equivalents, trade accounts receivable, net, prepaid expenses and other current assets, short-term and long-term restricted cash, short-term and long-term deposits, trade accounts payable, and accrued expenses and other current liabilities approximate fair value as of December 31, 2020 and 2019 due to the short maturity of these instruments.
The following tables set forth by level, within the fair value hierarchy, the Company’s long-term debt at fair value as of December 31, 2020 and 2019:
December 31, 2020
Carrying
     Amount (1)
Total Fair
Value		Quoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Term Loan Credit Facility - due June 2024$540,643 $379,614 $— $379,614 $— 
ABL Facility - due April 20223,350 3,057 — — 3,057 
LCC Note Payable24,423 20,328 — — 20,328 
LCC Water Treatment Obligation5,636 4,281 — — 4,281 
Total long-term debt$574,052 $407,280 $— $379,614 $27,666 
December 31, 2019
Carrying
Amount (1)
Total Fair
Value		Quoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Term Loan Credit Facility - due June 2024$538,765 $461,402 $461,402 $— $— 
LCC Note Payable37,695 33,884 — — 33,884 
LCC Water Treatment Obligation7,211 6,280 — — 6,280 
Total long-term debt$583,671 $501,566 $461,402 $— $40,164 
(1) Net of debt discounts and debt issuance costs.

The following tables set forth by level, within the fair value hierarchy, the Company’s acquisition-related obligations at fair value as of December 31, 2020 and 2019:
 December 31, 2020
Carrying
Amount (1)
Total Fair ValueQuoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
UMWA Funds Settlement Liability$1,662 $1,426 $— $— $1,426 
Environmental Settlement Obligations9,237 7,760 — — 7,760 
Total acquisition-related obligations$10,899 $9,186 $— $— $9,186 

 December 31, 2019
Carrying
Amount (1)
Total Fair ValueQuoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
UMWA Funds Settlement Liability$3,069 $2,929 $— $— $2,929 
Reclamation Funding Liability10,808 10,658 — — 10,658 
Environmental Settlement Obligations13,594 12,197 — — 12,197 
Total acquisition-related obligations$27,471 $25,784 $— $— $25,784 
(1) Net of discounts.

The following table sets forth by level, within the fair value hierarchy, the Company’s financial and non-financial assets and liabilities that were accounted for at fair value on a recurring basis as of December 31, 2020 and 2019. Financial and non-financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the determination of fair value for assets and liabilities and their placement within the fair value hierarchy levels.
 December 31, 2020
Total Fair ValueQuoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Contingent Revenue Obligation$28,967 $— $— $28,967 
Trading securities$22,498 $20,092 $2,406 $— 
 December 31, 2019
Total Fair ValueQuoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Contingent Revenue Obligation$52,427 $— $— $52,427 
Trading securities$11,021 $5,506 $5,515 $— 

The following table is a reconciliation of the financial and non-financial assets and liabilities that were accounted for at fair value on a recurring basis and that were categorized within Level 3 of the fair value hierarchy:
December 31, 2019PaymentsGain Recognized in EarningsTransfer In (Out) of Level 3 Fair Value HierarchyDecember 31, 2020
Contingent Revenue Obligation $52,427 $(14,710)$(8,750)$— $28,967 
(1) The gain recognized in earnings resulted primarily from a change in the forecasted future revenue associated with this obligation and an increase in annualized volatility as of December 31, 2020.
December 31, 2018PaymentsMeasurement-Period AdjustmentsGain Recognized in EarningsTransfer In (Out) of Level 3 Fair Value HierarchyDecember 31, 2019
Contingent Revenue Obligation$59,880 $(9,627)$5,738 $(3,564)$— $52,427 
(1) The measurement-period adjustments are related to Merger recorded during the year ended December 31, 2019.

The following methods and assumptions were used to estimate the fair values of the assets and liabilities in the tables above:
Level 1 Fair Value Measurements
Term Loan Credit Facility - due June 2024 - As of December 31, 2019, the fair value is based on observable market data.

Trading Securities - Includes money market funds and other cash equivalents. The fair value is based on observable market data.

Level 2 Fair Value Measurements
Term Loan Credit Facility - due June 2024 - As of December 31, 2020, the fair value is based on the average between bid and ask prices provided by a third-party. As the fair value is based on observable market inputs, the Company has classified the fair value within Level 2 of the fair value hierarchy. Due to limited trading volume in the Term Loan Credit Facility, the Company reclassified the fair value from Level 1 within the fair value hierarchy during the year ended December 31, 2020.

Trading Securities - Includes certificates of deposit, mutual funds, corporate debt securities and U.S. treasury and agency securities. The fair values of the Company’s trading securities are obtained from a third-party pricing service provider. The fair values provided by the pricing service provider are based on observable market inputs including credit spreads and broker-dealer quotes, among other inputs. The Company classifies the prices obtained from the pricing services within Level 2 of the fair value hierarchy because the underlying inputs are directly observable from active markets. However, the pricing models used entail a certain amount of subjectivity and therefore differing judgments in how the underlying inputs are modeled could result in different estimates of fair value.

Level 3 Fair Value Measurements

ABL Facility - due April 2022 - Observable transactions are not available to aid in determining the fair value of this item. Therefore, the fair value was derived by using the expected present value approach in which estimated cash flows are discounted using a risk-free interest rate adjusted for credit risk (discount rate of approximately 9%) as of December 31, 2020.
LCC Note Payable, LCC Water Treatment Obligation, UMWA Funds Settlement Liability, Environmental Settlement Obligations and Reclamation Funding Liability - Observable transactions are not available to aid in determining the fair value of these items. Therefore, the fair value was derived by using the expected present value approach in which estimated cash flows are discounted using a risk-free interest rate adjusted for credit risk (discount rates of approximately 34% and 21% as of December 31, 2020 and December 31, 2019, respectively).

Contingent Revenue Obligation - The fair value of the contingent revenue obligation was estimated using a Black-Scholes pricing model and is marked to market at each reporting period with changes in value reflected in earnings. The inputs included in the Black-Scholes pricing model are the Company's forecasted future revenue, the stated royalty rate, the remaining periods in the obligation; annual risk-free interest rate based on the U.S. Constant Maturity Treasury Curve and annualized volatility. The annualized volatility was calculated by observing volatilities for comparable companies with adjustments for the Company's size and leverage. The range of significant unobservable inputs used to value the contingent revenue obligation as of December 31, 2020 and December 31, 2019, are set forth in the following table:
 December 31, 2020December 31, 2019
Forecasted future revenue
$0.9 - $1.1 billion
$1.1 - $1.2 billion
Stated royalty rate
1.0% - 1.5%
1.0% - 1.5%
Annualized volatility
19.4% - 52.1% (28.0%)
9.4% - 28.1% (19.9%)
v3.20.4
Income Taxes
 12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
Total income tax benefit provided on loss before income taxes was allocated as follows:
Year Ended December 31,
20202019
Continuing operations$(2,164)$(53,287)
Discontinued operations— (8,484)
Total$(2,164)$(61,771)

Significant components of income tax (benefit) expense from continuing operations were as follows:
Year Ended December 31,
20202019
Current tax (benefit) expense:
Federal$(35,187)$(45,356)
State(99)1,891 
Total current$(35,286)$(43,465)
Deferred tax (benefit) expense:
Federal$33,348 $(747)
State(226)(9,075)
Total deferred $33,122 $(9,822)
Total income tax benefit:
Federal$(1,839)$(46,103)
State(325)(7,184)
Total$(2,164)$(53,287)

A reconciliation of statutory federal income tax benefit on loss from continuing operations to the actual income tax benefit is as follows:
Year Ended December 31,
20202019
Federal statutory income tax benefit$(51,163)$(57,310)
Increase (reductions) in taxes due to:
Percentage depletion allowance(2,039)(6,270)
AMT sequestration refund(2,123)— 
State taxes, net of federal tax impact(9,640)(10,255)
State tax rate and NOL change, net of federal tax impact(1,235)(4,172)
Change in valuation allowances59,929 10,936 
Net operating loss carryback— (14,234)
Amended return - capital loss impact— 919 
Non-deductible goodwill impairment— 26,114 
Stock-based compensation1,739 (1,085)
Other, net 2,368 2,070 
Income tax benefit$(2,164)$(53,287)

Deferred income taxes result from temporary differences between the reporting of amounts for financial statement purposes and income tax purposes. The net deferred tax assets and liabilities included in the Consolidated Balance Sheets include the following amounts:
Year Ended December 31,
20202019
Deferred tax assets:
  Asset retirement obligations$41,268 $51,114 
  Reserves and accruals not currently deductible12,131 8,265 
  Workers’ compensation benefit obligations59,478 54,128 
Pension obligations52,598 44,413 
  Equity method investments2,050 2,509 
Alternative minimum tax credit carryforwards— 33,065 
Loss carryforwards, net of Section 382 limitation255,772 142,510 
  Acquisition-related obligations10,002 17,902 
  Other 10,976 12,299 
     Gross deferred tax assets444,275 366,205 
Less valuation allowance(263,387)(133,020)
     Deferred tax assets$180,888 $233,185 
Deferred tax liabilities:
Property, plant and mineral reserves$(141,549)$(145,487)
  Acquired intangibles, net(22,037)(27,140)
  Prepaid expenses(6,211)(6,780)
Restricted cash(11,516)(20,313)
  Other (55)(822)
     Total deferred tax liabilities(181,368)(200,542)
     Net deferred tax assets$(480)$32,643 

Changes in the valuation allowance were as follows:
Year Ended December 31,
20202019
Valuation allowance beginning of period$133,020 $94,802 
Increase in valuation allowance recorded to income tax benefit117,829 29,950 
Increase in valuation allowance not affecting income tax expense12,538 8,268 
Valuation allowance end of period$263,387 $133,020 

On December 22, 2017, President Trump signed into law legislation commonly referred to as the “Tax Cuts and Jobs Act” (“TCJA”). Among other provisions, the TCJA repealed the corporate AMT and provided a mechanism for corporations to monetize their alternative minimum tax credits (“AMT Credits”) as a refundable credit during the 2018 through 2021 tax years. On March 27, 2020, President Trump signed into law legislation referred to as the CARES Act. The CARES Act modified the AMT Credits provision such that a corporate taxpayer’s remaining AMT Credits would be refunded in the 2019 tax year rather than the 2019 through 2021 tax years. As of December 31, 2019, the Company recorded a current federal income tax receivable of $33,065 and a deferred tax asset of $33,065 in relation to its refundable AMT Credits. During the first quarter of 2020 and following enactment of the CARES Act, the Company reclassified the $33,065 deferred tax asset to a current federal income tax receivable. The Company received the $66,130 AMT Credit refund in the fourth quarter of 2020. In addition, the Company received $2,123 related to AMT Credits claimed in prior tax years under a different Internal Revenue Code section, which were previously and erroneously subjected to the budgetary sequestration provisions. As of December 31, 2020, the Company does not expect to receive any further benefits related to AMT Credits.

The Company acquired the core assets of Alpha Natural Resources, Inc. as part of the Alpha Natural Resources, Inc. bankruptcy reorganization in transactions intended to be treated as a tax-free reorganization for U.S. federal income tax purposes. As a result of these transactions, the Company inherited the tax basis of the core assets and the net operating loss and other carryforwards of Alpha Natural Resources, Inc. On December 31, 2016, the net operating loss carryforwards and other carryforwards were reduced under Internal Revenue Code Section 108 due to the cancellation of indebtedness resulting from the Alpha Natural Resources, Inc. bankruptcy reorganization. Due to the change in ownership, the net operating loss and other carryforwards inherited in the Alpha Natural Resources, Inc. bankruptcy reorganization are subjected to significant limitations on their use in future years.

Due to the Company’s formation through acquisition of certain core coal assets as part of the Alpha Natural Resources, Inc. bankruptcy reorganization, the Company does not have a long history of operating results. Additionally, significant ownership change limitations limit the ability of the Company to utilize its net operating loss and other carryforwards in future years. The Company currently is relying primarily on the reversal of taxable temporary differences, along with consideration of taxable income via carryback to prior years and tax planning strategies, to support the realization of deferred tax assets. The Company assesses the realizability of its deferred tax assets, including scheduling the reversal of its deferred tax liabilities, to determine the amount of valuation allowance needed. Scheduling the reversal of deferred tax asset and liability balances requires judgment and estimation. The Company believes the deferred tax liabilities relied upon as future taxable income in its assessment will reverse in the same period and jurisdiction and are of the same character as temporary differences giving rise to the deferred tax assets that will be realized. The valuation allowance recorded represents the portion of deferred tax assets for which the Company is unable to support realization through the methods described above. The Company has concluded that it is more likely than not that the remaining deferred tax assets, net of valuation allowances, are realizable.

At December 31, 2020, the Company has regular tax net operating loss carryforwards for federal income tax purposes of approximately $1,737,000. This includes $1,011,000 that are available to offset regular federal taxable income subject to an annual Internal Revenue Code Section 382 limitation of approximately $1,000, $56,000 that are subject to an annual Section 382 limitation of approximately $18,300, and $324,000 that are subject to an annual Section 382 limitation of approximately $17,500. These federal net operating loss carryforwards were generated before 2018 and will expire between years 2030 and 2037. The Company also has $346,000 of federal net operating loss carryforwards with an indefinite carryforward period that can be used to offset up to 80% of taxable income. The Company has capital loss carryforwards of approximately $339,000, of which $65,000 are subject to an annual Section 382 limitation of approximately $1,000 and $51,000 are subject to an annual Section 382 limitation of approximately $17,500. The capital loss carryforwards will expire between years 2021 and 2025. A full valuation allowance is recorded against the capital loss carryforwards.
During the third quarter of the year ended December 31, 2020, the Company recorded a decrease in unrecognized tax benefits of approximately $20,788 as a result of the issuance of final regulatory guidance from the IRS. The decrease in unrecognized tax benefits did not impact the Company’s effective tax rate for the year ended December 31, 2020.

The Company’s policy is to classify interest and penalties related to uncertain tax positions as part of income tax expense. As of December 31, 2020 and 2019, the Company had no accrued interest and penalties.

The following reconciliation illustrates the Company’s liability for uncertain tax positions:
Year Ended December 31,
20202019
Unrecognized tax benefits - beginning of period$20,788 $— 
Additions for tax positions of prior years— 5,740 
Additions for tax positions of current year— 15,048 
Reductions for tax positions of prior years(20,788)— 
Unrecognized tax benefits - end of period$— $20,788 

As of December 31, 2020, tax years 2016 - 2020, which include the impact of net operating loss and other carryforwards and tax basis acquired from Alpha Natural Resources, Inc., remain open to federal and state examination. The IRS initiated a corporate income tax examination during the third quarter of 2020 for the Company’s 2016 tax year and related net operating loss carryback. This examination was open and in progress as of December 31, 2020.
v3.20.4
Employee Benefit Plans
 12 Months Ended
Dec. 31, 2020
Compensation Related Costs [Abstract]  
Employee Benefit Plans Employee Benefit Plans
The Company provides several types of benefits for its employees, including defined benefit and defined contribution pension plans, workers’ compensation and black lung benefits, and postretirement life insurance. The Company does not participate in any multi-employer plans. The components of net periodic (benefit) expense other than the service cost component for pension, black lung, and postretirement life insurance benefits are included in the line item miscellaneous loss, net, in the Consolidated Statements of Operations.

Company Administered Defined Benefit Pension Plans

In connection with the Merger, the Company assumed three qualified non-contributory defined benefit pension plans, which cover certain salaried and non-union hourly employees. The qualified non-contributory defined benefit pension plans are collectively referred to as the “Pension Plans.” Benefits are frozen under these plans. Participants accrued benefits either based on certain formulas, the participant’s compensation prior to retirement, or plan specified amounts for each year of service with the Company. One of the Company’s frozen qualified non-contributory defined benefit pension plans utilizes a cash balance formula for certain of its participants. The cash balance formula provides guaranteed rates of interest on accumulated balances of either 6% (for balances accumulated prior to 2004) and 4% (on balances accumulated thereafter).

Effective October 1, 2019, two of the qualified non-contributory defined benefit pension plans were amended to offer certain eligible participants the option to elect to receive lump sum benefits as of December 1, 2019, which resulted in a partial plan settlement and the accelerated recognition of a portion of the accumulated other comprehensive loss during the year ended December 31, 2020 and the three months ended December 31, 2019. Refer to the disclosures below for further information on the partial plan settlements.

Annual funding contributions to the Pension Plans are made as recommended by consulting actuaries based upon the ERISA funding standards. Plan assets consist of equity securities, fixed income funds, commingled short-term funds, private equity funds, and a guaranteed insurance contract.

The following tables set forth the plans’ accumulated benefit obligations, fair value of plan assets and funded status for the years ended December 31, 2020 and 2019.
Year Ended December 31,
20202019
Change in benefit obligations:
Accumulated benefit obligation at beginning of period:$674,439 $675,482 
Interest cost18,730 26,564 
Actuarial loss (1)
72,822 91,287 
Benefits paid(30,916)(31,371)
Acquisition— 1,910 
Settlement(11,627)(89,433)
Accumulated benefit obligation at end of period$723,448 $674,439 
Change in fair value of plan assets:
Fair value of plan assets at beginning of period$470,353 $494,680 
Actual return on plan assets54,222 87,129 
Employer contributions22,745 9,348 
Benefits paid(30,916)(31,371)
Settlement(11,627)(89,433)
Fair value of plan assets at end of period$504,777 $470,353 
Funded status$(218,671)$(204,086)
Accrued benefit cost at end of period (2)
$(218,671)$(204,086)
(1) For the years ended December 31, 2020 and December 31, 2019, the actuarial loss was primarily attributed to the decrease in the weighted-average discount rate actuarial assumption used in determining the benefit obligations.
(2) Amounts are classified as long-term on the Consolidated Balance Sheets as there are sufficient plan assets to make expected benefit payments to plan participants in the succeeding twelve months.

Gross amounts related to pension obligations recognized in accumulated other comprehensive loss consisted of the following as of December 31, 2020 and 2019:
December 31,
20202019
Net actuarial loss$88,583 $46,568 

The following table details the components of net periodic benefit (credit) cost:
Year Ended December 31,
20202019
Interest cost$18,730 $26,564 
Expected return on plan assets(27,064)(28,042)
Amortization of net losses2,012 797 
Settlement1,636 6,224 
Net periodic benefit (credit) cost$(4,686)$5,543 

Other changes in plan assets and benefit obligations recognized in other comprehensive loss are as follows:
Year Ended December 31,
20202019
Actuarial loss (1)
$45,663 $30,514 
Amortization of net actuarial loss(2,012)(797)
Settlement(1,636)(6,224)
Total recognized in other comprehensive loss$42,015 $23,493 
(1) For the years ended December 31, 2020 and December 31, 2019, the actuarial loss was primarily attributed to the decrease in the weighted-average discount rate actuarial assumption used in determining the benefit obligations.

The following table presents information applicable to plans with accumulated benefit obligations in excess of plan assets:
Year Ended December 31,
20202019
Projected benefit obligation$723,448 $674,439 
Accumulated benefit obligation$723,448 $674,439 
Fair value of plan assets$504,777 $470,353 

The weighted-average actuarial assumption used in determining the benefit obligations as of December 31, 2020 and 2019 was as follows: 
December 31,
20202019
Discount rate2.62 %3.36 %

The weighted-average actuarial assumptions used to determine net periodic benefit cost for the years ended December 31, 2020 and 2019 were as follows: 
Year Ended December 31,
20202019
Discount rate for benefit obligation3.35 %4.33 %
Discount rate for interest cost2.92 %4.01 %
Expected return on plan assets5.90 %5.80 %

The discount rate assumptions were determined from a high-quality corporate bond yield-curve timing of the Company’s projected cash out flows.

The expected long-term return on assets of the Pension Plans is established each year by the Company’s Benefits Committee in consultation with the plans’ actuaries and outside investment advisors. This rate is determined by taking into consideration the Pension Plans’ target asset allocation, expected long-term rates of return on each major asset class by reference to long-term historic ranges, inflation assumptions and the expected additional value from active management of the Pension Plans’ assets. For the determination of net periodic benefit cost in 2021, the Company will utilize an expected long-term return on plan assets of 5.80%.

Assets of the Pension Plans are held in trusts and are invested in accordance with investment guidelines that have been established by the Company’s Benefits Committee in consultation with outside investment advisors. The target allocation for 2021 and the actual asset allocation as reported at December 31, 2020 are as follows:
Target Allocation Percentages 2021Percentage of Plan Assets 2020
Equity securities60.0 %47.0 %
Fixed income funds40.0 %50.0 %
Other— %3.0 %
Total100.0 %100.0 %

The asset allocation targets have been set with the expectation that the Pension Plans’ assets will fund the expected liabilities within an appropriate level of risk. In determining the appropriate target asset allocations, the Benefits Committee considers the demographics of the Pension Plans’ participants, the funding status of each plan, the Company’s contribution philosophy, the Company’s business and financial profile, and other associated risk factors. The Pension Plans’ assets are periodically rebalanced among the major asset categories to maintain the asset allocation within a specified range of the target
allocation percentage. In September 2020, the target allocation was adjusted by the Company’s Benefits Committee to transition to 60.0% equity securities and 40.0% fixed income funds in approximate 2.0% increments over a 10-month period.

The Company expects to contribute $25,541 to the Pension Plans in 2021.

The following represents expected future pension benefit payments for the next ten years:
2021$31,178 
202231,267 
202331,628 
202432,149 
202532,426 
2026-2030162,622 
$321,270 

The fair values of the Company’s Pension Plans’ assets as of December 31, 2020, by asset category are as follows:
Asset CategoryTotalQuoted Market Prices in Active Market for Identical Assets (Level 1)Significant Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Equity securities:
Multi-asset fund (1)
$236,405 $— $236,405 $— 
Fixed income funds:
Bond fund (2)
253,218 — 253,218 — 
Commingled short-term fund (3)
1,405 — 1,405 — 
Other types of investments:
Guaranteed insurance contract11,454 — — 11,454 
Total$502,482 $— $491,028 $11,454 
Receivable (4)
888 
Total assets at fair value503,370 
Private equity funds measured at net asset value practical expedient (5)
1,407 
Total plan assets$504,777 
(1) This fund contains equities (domestic and international), real estate and bonds.
(2) This fund contains bonds representing a diversity of sectors and maturities. This fund also includes mortgage-backed securities and U.S. Treasuries.
(3) This fund contains cash and highly liquid short-term investments in a collective investment fund.
(4) Receivable for investments sold at December 31, 2020, which approximates fair value.
(5) In accordance with Accounting Standards Update 2015-07, investments that are measured at fair value using the net asset value per share practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the total value of assets of the plans.

Changes in Level 3 plan assets for the period ended December 31, 2020 were as follows:
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Guaranteed Insurance Contract
Beginning balance, December 31, 2019$11,155 
Actual return on plan assets:
Relating to assets still held at the reporting date659 
Purchases, sales and settlements(360)
Ending balance, December 31, 2020$11,454 

The fair values of the Company’s Pension Plans’ assets as of December 31, 2019, by asset category are as follows:
Asset CategoryTotalQuoted Market Prices in Active Market for Identical Assets (Level 1)Significant Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Equity securities:
Multi-asset fund (1)
$182,782 $— $182,782 $— 
Fixed income funds:
Bond fund (2)
272,239 — 272,239 — 
Commingled short-term fund (3)
1,572 — 1,572 — 
Other types of investments:
Guaranteed insurance contract11,155 — — 11,155 
Total$467,748 $— $456,593 $11,155 
Receivable (4)
1,061 
Total assets at fair value468,809 
Private equity funds measured at net asset value practical expedient (5)
1,544 
Total plan assets$470,353 
(1) This fund contains equities (domestic and international), real estate and bonds.
(2) This fund contains bonds representing a diversity of sectors and maturities. This fund also includes mortgage-backed securities and U.S. Treasuries.
(3) This fund contains cash and highly liquid short-term investments in a collective investment fund.
(4) Receivable for investments sold at December 31, 2019, which approximates fair value.
(5) In accordance with Accounting Standards Update 2015-07, investments that are measured at fair value using the net asset value per share practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the total value of assets of the plans.

Changes in Level 3 plan assets for the period ended December 31, 2019 were as follows:
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Guaranteed Insurance Contract
Beginning balance, December 31, 2018$10,886 
Acquisition— 
Actual return on plan assets:
Relating to assets still held at the reporting date644 
Purchases, sales and settlements(375)
Ending balance, December 31, 2019$11,155 

The following is a description of the valuation methodologies used for assets measured at fair value:
Level 1 Plan Assets: Assets consist of individual security positions that are easily traded on recognized market exchanges. These securities are priced and traded daily, and therefore the fund is valued daily.

Level 2 Plan Assets: Funds consist of individual security positions that are mostly securities easily traded on recognized market exchanges. These securities are priced and traded daily, and therefore the fund is valued daily.

Level 3 Plan Assets: Assets are valued monthly or quarterly based on the Market Value provided by managers of the underlying fund investments. The Market Value provided typically reflects the fair value of each underlying fund investment, including unrealized gains and losses.

Workers’ Compensation and Pneumoconiosis (Black Lung)

The Company is required by federal and state statutes to provide benefits to employees for awards related to workers’ compensation and black lung.

The Company’s subsidiaries utilize high-deductible third-party insurance for worker’s compensation and black lung obligations with the exception of certain subsidiaries in which the Company is a qualified self-insurer for workers’ compensation and/or black lung obligations. The Company’s subsidiaries that are self-insured for black lung benefits may fund benefit payments through a Section 501(c) (21) tax-exempt trust fund.

Pursuant to the Merger Agreement, the Company assumed a reinsurance contract with a third party. In 2017, the Merger Companies made a lump sum payment in exchange for a reinsurance company’s agreement to administer and pay certain future workers’ compensation and state black lung obligations in the state of Kentucky. Pursuant to the Merger Agreement, the Company assumed the estimated liability for these future claims. As the liabilities are paid by the insurance company, the prepaid insurance amounts will be reduced by a corresponding amount.

The Company accrues for workers’ compensation liability by recognizing costs when it is probable that a covered liability has been incurred and the cost can be reasonably estimated. The Company’s estimates of these costs are adjusted based upon actuarial studies and include a provision for incurred but not reported losses. Actual losses may differ from these estimates, which could increase or decrease the Company’s costs. Additionally, the liability for black lung benefits is estimated by an independent actuary by prorating the accrual of actuarially projected benefits over the employee’s applicable term of service. Adjustments to the probable ultimate liability for workers’ compensation and black lung are made annually based on actuarial valuations.

At December 31, 2020, the Company had $124,260 of workers’ compensation liability, including a current portion of $10,355 recorded in accrued expenses and other current liabilities, offset by $2,368 and $48,320 of expected insurance receivable recorded in prepaid expenses and other current assets and other non-current assets, respectively, in the Consolidated Balance Sheets. At December 31, 2019, the Company had $136,540 of workers’ compensation liability, including a current portion of $11,317 recorded in accrued expenses and other current liabilities, offset by $2,375 and $52,757 of expected insurance receivable recorded in prepaid expenses and other current assets and other non-current assets, respectively, in the Consolidated Balance Sheets.

For the Company’s subsidiaries that are insured with a high-deductible insurance plan for workers’ compensation and black lung claims, the insurance premium expense for the years ended December 31, 2020 and 2019 was $7,000 and $10,684, respectively.

Workers’ compensation expense for high-deductible insurance plans for the years ended December 31, 2020 and 2019 was $1,275 and $2,333, respectively.
The divestiture of the Company’s former NAPP operations during the fourth quarter of 2020 (refer to Note 3) resulted in a partial plan settlement of $8,290 and the accelerated recognition of a portion of the accumulated other comprehensive loss of $1,563 during the three months ended December 31, 2020. Refer to the disclosures below for further information on the partial plan settlement.

As a result of the strategic actions impacting certain mines during the three months ended June 30, 2020 (refer to Note 8), black lung obligations were revalued for curtailment and remeasured with an updated discount rate as of May 31, 2020, which resulted in an increase in the liability for black lung obligations of approximately $7,400 with the offset to accumulated other comprehensive loss and a slight increase in net periodic expense to be recognized subsequent to the remeasurement date. Refer to the disclosures below for further information.

The following tables set forth the accumulated black lung benefit obligations, fair value of plan assets and funded status for the years ended December 31, 2020 and 2019:
Year Ended December 31,
20202019
Change in benefit obligation:
Accumulated benefit obligation at beginning of period$122,788 $94,805 
Service cost2,361 2,057 
Interest cost3,240 4,474 
Actuarial loss (1)
14,736 11,166 
Benefits paid(7,166)(6,543)
Acquisition— 16,829 
Curtailment gain(163)— 
Settlement(8,290)— 
Accumulated benefit obligation at end of period$127,506 $122,788 
Change in fair value of plan assets:
Fair value of plan assets at beginning of period$2,660 $2,597 
Actual return on plan assets60 63 
Benefits paid(7,166)(6,543)
Employer contributions7,166 6,543 
Fair value of plan assets at end of period (2)
2,720 2,660 
Funded status$(124,786)$(120,128)
Accrued benefit cost at end of period$(124,786)$(120,128)
Summary of accrued benefit cost at end of period:
Continuing operations(122,961)(111,036)
Discontinued operations (3)
(1,825)(9,092)
Total accrued benefit cost at end of period$(124,786)$(120,128)
(1) For the years ended December 31, 2020 and December 31, 2019, the actuarial loss was primarily attributed to the decrease in the weighted-average discount rate actuarial assumption used in determining the benefit obligations and the annual updates to demographic information.
(2) Assets of the plan are held in a Section 501(c)(21) tax-exempt trust fund and consist primarily of government debt securities. All assets are classified as Level 1 and valued based on quoted market prices.
(3) The discontinued operations consisted of activity related to the Company’s former NAPP operations. Refer to Note 3.

The table below presents amounts recognized in the Balance Sheets:
December 31,
20202019
Current liabilities$6,784 $7,409 
Current liabilities - discontinued operations26 63 
Long-term liabilities116,177 103,627 
Long-term liabilities - discontinued operations1,799 9,029 
$124,786 $120,128 

Gross amounts related to the black lung obligations recognized in accumulated other comprehensive loss consisted of the following as of December 31, 2020 and 2019: 
December 31,
20202019
Net actuarial loss $24,042 $12,980 

The following table details the components of the net periodic benefit cost for black lung obligations:
Year Ended December 31,
20202019
Service cost$2,361 $2,057 
Interest cost3,240 4,474 
Expected return on plan assets(54)(65)
Amortization of net actuarial loss 1,942 216 
Settlement1,563 — 
Net periodic benefit cost$9,052 $6,682 
Summary net periodic benefit cost:
Continuing operations$7,670 $6,394 
Discontinued operations (1)
1,382 288 
Total net periodic benefit cost$9,052 $6,682 
(1) The discontinued operations consisted of activity related to the Company’s former NAPP operations. Refer to Note 3.

Other changes in the black lung plan assets and benefit obligations recognized in other comprehensive loss are as follows:
Year Ended December 31,
20202019
Actuarial loss (1)
$14,567 $11,512 
Amortization of net actuarial loss(1,942)(216)
Settlement(1,563)— 
Total recognized in other comprehensive loss $11,062 $11,296 
(1) For the years ended December 31, 2020 and December 31, 2019, the actuarial loss was primarily attributed to the decrease in the weighted-average discount rate actuarial assumption used in determining the benefit obligations and the annual updates to demographic information.

The weighted-average assumptions related to black lung obligations used to determine the benefit obligation as of December 31, 2020 and 2019 were as follows: 
December 31,
20202019
Discount rate2.75 %3.47 %
Federal black lung benefit trend rate2.00 %2.00 %
Black lung medical benefit trend rate5.00 %5.00 %
Black lung benefit expense inflation rate2.00 %2.00 %

The weighted-average assumptions related to black lung obligations used to determine net periodic benefit cost were as follows:
Year Ended December 31,
20202019
Discount rate for benefit obligation3.47 %4.36 %
Discount rate for service cost3.56 %4.54 %
Discount rate for interest cost2.61 %3.99 %
Federal black lung benefit trend rate2.50 %2.50 %
Black lung medical benefit trend rate5.00 %5.00 %
Black lung benefit expense inflation rate2.00 %2.50 %
Expected return on plan assets2.00 %2.50 %

Estimated future cash payments related to black lung obligations for the next 10 years ending after December 31, 2020 are as follows: 
Year ending December 31:
2021$6,810 
20226,929 
20237,038 
20247,112 
20257,244 
2026-203020,004 
$55,137 

Postretirement Life Insurance Benefits

As part of the Alpha Natural Resources, Inc. bankruptcy reorganization process and the Retiree Committee Settlement Agreement, the Company assumed the liability for life insurance benefits for certain disabled and non-union retired employees. Provisions are made for estimated benefits and adjustments to the probable ultimate liabilities are made annually based on an actuarial study prepared by independent actuaries. These obligations are included in the Consolidated Balance Sheet as accrued expenses and other current liabilities and other non-current liabilities.

The following tables set forth the accumulated postretirement life insurance benefit obligations, fair value of plan assets and funded status for the years ended December 31, 2020 and 2019:
December 31,
20202019
Change in benefit obligation:
Accumulated benefit obligation at beginning of period$12,341 $11,368 
Interest cost337 426 
Actuarial loss420 1,002 
Benefits paid(463)(455)
Accumulated benefit obligation at end of period$12,635 $12,341 
Change in fair value of plan assets:
Benefits paid (1)
(463)(455)
Employer contributions (1)
463 455 
Fair value of plan assets at end of period$— $— 
Funded status(12,635)(12,341)
Accrued benefit cost at end of year$(12,635)$(12,341)
Amounts recognized in the consolidated balance sheets:
Current liabilities$628 $719 
Long-term liabilities12,007 11,622 
$12,635 $12,341 
(1) Amount is comprised of premium payments to commercial life insurance provider.

Gross amounts related to the postretirement life insurance benefit obligations recognized in accumulated other comprehensive income consisted of the following as of December 31, 2020 and 2019: 
December 31,
20202019
Net actuarial gain$(390)$(872)

The following table details the components of the net periodic benefit cost for postretirement life insurance benefit obligations:
December 31,
20202019
Interest cost$337 $426 
Amortization of net actuarial gain(48)(105)
Settlement(14)— 
Net periodic benefit cost$275 $321 

Other changes in the postretirement life insurance plan assets and benefit obligations recognized in other comprehensive income are as follows:
December 31,
20202019
Actuarial loss$420 $1,002 
Amortization of net actuarial gain48 105 
Settlement14 — 
Total recognized in other comprehensive income $482 $1,107 
The weighted-average assumptions related to postretirement life insurance benefit obligations used to determine the benefit obligation as of December 31, 2020 and 2019 was as follows: 
December 31,
20202019
Discount rate2.43 %3.22 %

The weighted-average assumptions related to postretirement life insurance benefit obligations used to determine net periodic benefit cost were as follows:
Year Ended December 31,
20202019
Discount rate for benefit obligations3.22 %4.21 %
Discount rate for interest cost2.83 %3.9 %

Estimated future cash payments related to postretirement life insurance benefit obligations for the next 10 years ending after December 31, 2020 are as follows: 
Year ending December 31:
2021$628 
2022588 
2023586 
2024586 
2025587 
2026-20302,941 
$5,916 

Defined Contribution and Profit-Sharing Plans

The Company sponsors defined contribution plans to assist its eligible employees in providing for retirement. Generally, under the terms of these plans, employees make voluntary contributions through payroll deductions and the Company makes matching and/or discretionary contributions, as defined by each plan. The Company’s total contributions to these plans for the years ended December 31, 2020 and 2019 were $3,613 and $22,102, respectively.

During the second quarter of 2020, the Company’s matching contributions under the Contura Energy 401(k) Retirement Savings Plan were suspended due to current market conditions.

Self-insured Medical Plan
The Company is self-insured for health benefit coverage for all of its active employees. Estimated liabilities for health and medical claims are recorded based on the Company’s historical experience and include a component for incurred but not paid claims. During the years ended December 31, 2020 and 2019, the Company incurred total expenses of $52,517 and $64,430, respectively, which primarily include claims processed and an estimate for claims incurred but not paid.
v3.20.4
Stock-Based Compensation Awards
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Awards Stock-Based Compensation AwardsThe MIP is currently authorized for the issuance of awards of up to 1,201,202 shares of common stock, and as of December 31, 2020, there were 89,780 shares of common stock available for grant under the MIP. The Long-Term Incentive Plan (the “LTIP”) is currently authorized for the issuance of awards of up to 1,000,000 shares of common stock, and as of December 31, 2020, there were 349,373 shares of common stock available for grant under the LTIP. Pursuant to the Merger Agreement, the Company assumed the ANR Inc. 2017 Equity Incentive Plan (the “ANR EIP”), which had underlying ANR shares that were converted to 89,766 Contura Energy, Inc. shares. The ANR EIP is not authorized for additional issuance of
awards of shares of common stock, and as of December 31, 2020, there were no shares of common stock available for grant under the ANR EIP.
As of December 31, 2020, the Company had four types of stock-based awards outstanding: time-based restricted stock units, performance-based restricted stock units, stock options, and performance-based cash awards. Stock-based compensation expense totaled $5,540 and $12,397 for the years ended December 31, 2020 and 2019, respectively. For the years ended December 31, 2020 and 2019, approximately 83% and 76%, respectively, of stock-based compensation expense was reported as selling, general and administrative expenses, and the remainder was recorded as cost of coal sales.
The Company is authorized to repurchase common shares from employees (upon the election by the employee) to satisfy the employees’ statutory tax withholdings upon the vesting of stock grants. Shares that are repurchased to satisfy the employees’ statutory tax withholdings are recorded in treasury stock at cost. During the year ended December 31, 2020, the Company repurchased 43,559 shares of its common stock issued pursuant to awards under the MIP, LTIP and ANR EIP for a total purchase amount of $209, or $4.79 average price paid per share. During the year ended December 31, 2019, the Company repurchased 118,935 shares of its common stock issued pursuant to awards under the MIP, LTIP and ANR EIP for a total purchase amount of $5,159, or $43.37 average price paid per share.
2020 Awards Granted
During the year ended December 31, 2020, the Company granted certain key employees and non-employee directors 402,620 time-based restricted stock units under the MIP and LTIP with a weighted average grant date fair value of $6.17 based on the Company’s closing stock price at the trading day before the date of the grant. The awards granted to key employees will vest ratably over a three-year period from date of grant in accordance with the vesting schedule, subject to the participant’s continuous service with the Company through each applicable vesting date. The awards granted to non-employee directors will vest on the first to occur of (i) April 30, 2021, (ii) the director’s separation from service due to the director’s death or physical or mental incapacity to perform his or her usual duties, such condition likely to remain continuously and permanently, as determined by the Company, (iii) a change in control, and (iv) the director's service as a member of the board of directors is terminated as of a date that is after October 31, 2021 but prior to May 1, 2022 for any reason other than removal for cause. Upon vesting and settlement of time-based restricted stock units, the Company issues authorized and unissued shares of the Company’s common stock to the recipient.
Additionally, during the year ended December 31, 2020, the Company granted the Chief Executive Officer (“CEO”) 302,795 performance-based restricted stock units granted under the LTIP which represent the number of shares of common stock that may be issued based on the achievement of targeted performance levels related to pre-established relative total shareholder return goals and annually determined operational goals over a three year period. This award was scheduled to cliff vest on the third anniversary of the date of the grant, subject to the participant’s continuous service with the Company through the applicable vesting date and the satisfaction of the performance criteria. These performance-based restricted stock units had the potential to be earned from 0% to 200% of target depending on actual results. Upon vesting of these awards, the Company would issue authorized and previously unissued shares of the Company’s common stock to the recipient. The 151,398 operational performance-based restricted stock units were valued based on the Company’s closing stock price at the trading day before the date of the grant and had a weighted average grant date fair value of $6.36. For the awards with operational performance conditions, the Company reassessed at each reporting date whether achievement of each of the performance conditions was probable and adjusted the accrual of stock-based compensation expense as needed. The 151,397 relative total shareholder return performance-based restricted stock units were valued relative to the stock price performance of a comparator
group and had a weighted average grant date fair value of $8.53 based on a Monte Carlo simulation. The Monte Carlo simulation incorporated the assumptions as presented in the following table:
Relative performance-based restricted stock units
Start price (1)
$7.59 
Valuation date stock price (2)
$6.33 
Expected volatility (3)
55.27 %
Risk-free interest rate (4)
1.37 %
Expected dividend yield (5)
— %
(1)    The start price for the Company represented the average closing stock price over the twenty trading days ending on December 31, 2019, assuming dividends distributed during this period were reinvested in additional shares of the Company’s stock on the ex-dividend date.
(2)    The valuation date stock price represented the closing price on the grant date.
(3)    The expected volatility assumption was based on the historical volatility of the price of the Company’s stock.
(4)    The annual risk-free interest rate equaled the yield on the semi-annual zero coupon U.S. Treasury rates converted to continuously compounded rates that had a term equal to the length of the remaining performance measurement period as of the valuation date.
(5)    The expected dividend yield represented the investments return to a share of the Company’s stock that is not available to the holder of the performance-based restricted stock unit.

During the first quarter of 2021, the 302,795 performance-based restricted stock units granted under the LTIP were voluntarily forfeited by the CEO in conjunction with an amendment to his employment agreement and the shares were allocated back to the LTIP for future issuance. The amendment also included an amendment to the participant’s time-based restricted stock granted under the MIP, such that the ratable vesting initially scheduled to occur on the second and third anniversaries of the award shall instead both occur on the second anniversary of the award.

Additionally, the Company granted certain key employees performance-based cash incentive awards granted under the LTIP with a target award amount of $2,755. The cash to be awarded is based on the achievement of pre-established relative total shareholder return goals over a three-year period. These awards are scheduled to cliff vest on the third anniversary of the date of the grant, subject to the participant’s continuous service with the Company through the applicable vesting date and the satisfaction of the performance criteria. These awards have the potential to be distributed from 0% to 200% of target depending on actual performance. Upon vesting of these awards, the Company issues cash to the recipient. These awards are classified as a liability, and the Company reassesses at each reporting date the fair value of the award and adjusts the accruals of stock-based compensation expense as appropriate based on a Monte Carlo simulation. As of December 31, 2020, the liability for these awards totaled $643. The performance-based cash incentive awards were valued relative to the stock price performance of a comparator group and had a weighted average grant date fair value as a percent of target dollar value of 82.45% based on a Monte Carlo simulation. The Monte Carlo simulation incorporates the assumptions as presented in the following table:
Performance-based cash incentive awards
Start price (1)
$7.59 
Valuation date stock price (2)
$6.33 
Expected volatility (3)
55.27 %
Risk-free interest rate (4)
1.37 %
Expected dividend yield (5)
— %
(1)    The start price for the Company represents the average closing stock price over the twenty trading days ending on December 31, 2019, assuming dividends distributed during this period were reinvested in additional shares of the Company’s stock on the ex-dividend date.
(2)    The valuation date stock price represents the closing price at each reporting date.
(3)    The expected volatility assumption is based on the historical volatility of the price of the Company’s stock.
(4)    The annual risk-free interest rate equals the yield on the semi-annual zero coupon U.S. Treasury rates converted to continuously compounded rates that have a term equal to the length of the remaining performance measurement period as of the valuation date.
(5)    The expected dividend yield represents the investments return to a share of the Company’s stock that is not available to the holder of the performance-based restricted stock unit.
2019 Awards Granted
During the year ended December 31, 2019, the Company granted certain key employees and non-employee directors 79,474 time-based restricted stock units under the LTIP with a weighted average grant date fair value of $49.47 based on the Company’s closing stock price at the trading day before the date of the grant. The awards granted to key employees will either vest ratably over a three-year period or cliff vest in one year from date of grant in accordance with the vesting schedule, subject to the participant’s continuous service with the Company through each applicable vesting date. The awards granted to non-employee directors will vest on the first to occur of (i) April 30, 2020, (ii) the director’s separation from service due to the director’s death or physical or mental incapacity to perform his or her usual duties, such condition likely to remain continuously and permanently, as determined by the Company, and (iii) a change in control. Upon vesting and settlement of time-based restricted stock units, the Company issues authorized and unissued shares of the Company’s common stock to the recipient.
Additionally, during the year ended December 31, 2019, the Company granted certain key employees 81,065 relative total shareholder return performance-based restricted stock units under the LTIP that are valued relative to the median stock price performance of a comparator group and had a weighted average grant date fair value of $65.70 based on a Monte Carlo simulation, and 27,042 absolute total shareholder return performance-based restricted stock units under the LTIP that are valued based on the Company’s stock price performance with a weighted average grant date fair value of $50.60 based on a Monte Carlo simulation. These awards cliff vest on the third anniversary of the date of the grant, subject to continued employment and the satisfaction of the performance criteria. These awards have the potential to be distributed from 0% to 400% of target for the relative total shareholder return units, and 0% to 200% of target for the absolute total shareholder return units depending on actual results versus the pre-established performance criteria over the three-year period. The Monte Carlo simulations incorporate the assumptions as presented in the following tables:
Relative performance-based restricted stock units
Start price (1)
$66.06 
Dividend adjusted stock price (2)
$61.27 
Expected volatility (3)
29.98 %
Risk-free interest rate (4)
2.42 %
Expected dividend yield (5)
— %
(1)    The start price for the Company represents the average closing stock price over the ten trading days ending on December 31, 2018, assuming dividends distributed during this period were reinvested in additional shares of the Company’s stock on the ex-dividend date.
(2)    The dividend adjusted stock price represents the closing price on the grant date assuming dividends distributed during the period since December 17, 2018, were reinvested in additional shares of the Company’s stock on the ex-dividend date.
(3)    The expected volatility assumption is based on the historical volatility of the price of the Company’s stock.
(4)    The annual risk-free interest rate equals the yield on zero coupon U.S. Treasury Separate Trading of Registered Interest and Principal of Securities (“STRIPS”) that have a term equal to the length of the remaining performance measurement period as of the valuation date.
(5)    The expected dividend yield represents the investments return to a share of the Company’s stock that is not available to the holder of an absolute performance-based restricted stock unit.
Absolute performance-based restricted stock units
Valuation date stock price$61.27 
Expected volatility (1)
29.98 %
Risk-free interest rate (2)
2.42 %
Expected dividend yield (3)
— %
(1)    The expected volatility assumption is based on the historical volatility of the price of the Company’s stock.
(2)    The annual risk-free interest rate equals the yield on zero coupon U.S. Treasury STRIPS that have a term equal to the length of the remaining performance measurement period as of the valuation date.
(3)    The expected dividend yield represents the investments return to a share of the Company’s stock that is not available to the holder of an absolute performance-based restricted stock unit.
Restricted Stock
Restricted stock activity for the year ended December 31, 2020 is summarized in the following table: 
Restricted stock activity:Number of  SharesWeighted-Average Grant  Date Fair Value
Non-vested shares outstanding at December 31, 201923,598 $65.55 
Granted— $— 
Vested(23,598)$65.55 
Forfeited or Expired— $— 
Non-vested shares outstanding at December 31, 2020— $— 

As of December 31, 2020, there was no unrecognized compensation cost related to non-vested restricted stock units.

Restricted Stock Units

Time-Based Restricted Stock Units

Time-based restricted stock unit activity for the year ended December 31, 2020 is summarized in the following table: 
Time-based restricted stock unit activity:Number of  SharesWeighted-Average Grant  Date Fair Value
Non-vested shares outstanding at December 31, 2019158,082 $64.84 
Granted402,620 $6.17 
Vested (1)
(149,829)$45.22 
Forfeited or Cancelled(43,320)$21.10 
Non-vested shares outstanding at December 31, 2020367,553 $13.72 
(1) Includes 33,508 shares with deferred settlement pursuant to the award agreement.

As of December 31, 2020, there was $1,707 of unrecognized compensation cost related to non-vested time-based restricted stock units which is expected to be recognized as expense over a weighted-average period of 1.30 years.

Performance-Based Restricted Stock Units

Relative performance-based restricted stock unit activity for the year ended December 31, 2020 is summarized in the following table: 
Relative performance-based restricted stock unit activity:Number of  SharesWeighted-Average Grant  Date Fair Value
Non-vested shares outstanding at December 31, 201931,599 $65.70 
Granted151,397 $8.53 
Vested (1)
(3,864)$65.70 
Forfeited(4,929)$65.70 
Non-vested shares outstanding at December 31, 2020174,203 $16.01 
(1) Includes 3,042 of vested shares due to the employment criteria being satisfied during the period. Until the performance criteria is satisfied, these shares will remain unsettled.

As of December 31, 2020, there was $1,471 of unrecognized compensation cost related to non-vested relative performance-based restricted stock units which is expected to be recognized as expense over a weighted-average period of 1.75 years.
Absolute performance-based restricted stock unit activity for the year ended December 31, 2020 is summarized in the following table: 
Absolute performance-based restricted stock unit activity:Number of SharesWeighted-Average Grant  Date Fair Value
Non-vested shares outstanding at December 31, 201910,549 $50.60 
Granted— $— 
Vested (1)
(1,290)$50.60 
Forfeited(1,645)$50.60 
Non-vested shares outstanding at December 31, 20207,614 $50.60 
(1) Includes 1,016 of vested shares due to the employment criteria being satisfied during the period. Until the performance criteria is satisfied, these shares will remain unsettled.

As of December 31, 2020, there was $142 of unrecognized compensation cost related to non-vested absolute performance-based restricted stock units which is expected to be recognized as expense over a weighted-average period of 1.11 years.
Operational performance-based restricted stock unit activity for the year ended December 31, 2020 is summarized in the following table: 
Operational performance-based restricted stock unit activity:
Number of  SharesWeighted-Average Fair Value
Non-vested shares outstanding at December 31, 2019— $— 
Granted151,398 $6.36 
Vested— $— 
Forfeited— $— 
Non-vested shares outstanding at December 31, 2020151,398 $6.36 

As of December 31, 2020, there was $260 of unrecognized compensation cost related to non-vested operational performance-based restricted stock units which is expected to be recognized as expense over a weighted-average period of 2.13 years.
Stock Options
30-Day Volume-Weighted Average Price (“VWAP”) Stock Options
30-day VWAP stock option activity for the year ended December 31, 2020 is summarized in the following table:
Number of SharesWeighted-Average Exercise Price Per ShareWeighted-Average Remaining Contractual Term (Years)
Aggregate Intrinsic Value (1)
Outstanding at December 31, 201951,359 $63.45 7.15$(2,794)
Exercisable at December 31, 201944,356 $63.03 7.15$(2,394)
Granted— $— 
Exercised— $— $— 
Forfeited or Expired(28,134)$66.13 
Outstanding at December 31, 202023,225 $60.20 6.12$(1,134)
Exercisable at December 31, 202023,225 $60.20 6.12$(1,134)
(1) The aggregate intrinsic value of outstanding and exercisable options is calculated as the difference between the exercise price and the Company’s stock price at each reporting period end. The aggregate intrinsic value of exercised options is calculated as the difference between the exercise price and the Company’s stock price on the exercise date. During the year ended December 31, 2019, the aggregate intrinsic value of options exercised was $6,305.
As of December 31, 2020, there was $0 of unrecognized compensation cost related to the 30-day VWAP stock options.

Fixed Price Stock Options

As December 31, 2020 and 2019, there were no fixed price stock options outstanding or exercisable. During the year ended December 31, 2019, the aggregate intrinsic value of options exercised was $6,879. As of December 31, 2020, there was no unrecognized compensation cost related to the fixed price stock options.

Performance-Based Cash Incentive Awards
Performance-based cash incentive award activity for the year ended December 31, 2020 is summarized in the following table: 
Performance-based cash incentive award activity:Target Dollar ValueWeighted-Average Fair Value as a % of Target Dollar Value
Non-vested awards outstanding at December 31, 2019$— — %
Granted2,755 82.45 %
Vested (1)
(42)100.00 %
Forfeited(507)70.70 %
Non-vested awards outstanding at December 31, 2020$2,206 94.21 %
(1) Vested awards were paid at target dollar value due to the employment criteria being satisfied during the period.

As of December 31, 2020, there was $1,447 of unrecognized compensation cost related to non-vested performance-based cash incentive awards which is expected to be recognized as expense over a weighted-average period of 2.13 years.
v3.20.4
Related Party Transactions
 12 Months Ended
Dec. 31, 2020
Related Party Transactions [Abstract]  
Related Party Transactions Related Party Transactions
There were no material related party transactions for the year ended December 31, 2020.

On June 14, 2019, the Company entered into a Credit Agreement which provides for the Term Loan Credit Facility as provided by a group of existing shareholders as of the agreement date. Refer to Note 15 for additional disclosures.

On July 19, 2019, in association with the Blackjewel Chapter 11 bankruptcy filing, the U.S. Bankruptcy Court approved debtor-in-possession (“DIP”) financing of $2,900 with DIP lenders, Highbridge Capital Management, LLC and Whitebox Advisors LLC, shareholders of the Company. The Company entered into an arrangement on July 19, 2019 to purchase the obligations under the DIP financing at the request of the lenders thereunder pursuant to certain terms and conditions.

On September 12, 2019, the Company entered into a common stock repurchase agreement with Whitebox, shareholders of the Company. Refer to Note 13 for additional disclosures.

There were no other material related party transactions for the year ended December 31, 2019.
v3.20.4
Commitments and Contingencies
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Commitments and Contingencies Commitments and Contingencies
(a) General
Estimated losses from loss contingencies are accrued by a charge to income when information available indicates that it is probable that an asset has been impaired or a liability has been incurred and the amount of the loss can be reasonably estimated.
If a loss contingency is not probable or reasonably estimable, disclosure of the loss contingency is made in the Consolidated Financial Statements when it is at least reasonably possible that a loss may be incurred and that the loss could be material.
(b) Commitments and Contingencies
Commitments
The Company leases coal mining and other equipment under long-term financing and operating leases with varying terms. Refer to Note 12 for further information on leases. In addition, the Company leases mineral interests and surface rights from landowners under various terms and royalty rates.
Coal royalty expense was $67,992 and $91,879 for the years ended December 31, 2020 and 2019, respectively.

Minimum royalty obligations under coal leases total $15,708, $14,525, $13,633, $11,560, $10,815, and $43,603 for 2021, 2022, 2023, 2024, 2025, and after 2025, respectively.

Other Commitments

The Company has obligations under certain coal purchase agreements that contain minimum quantities to be purchased in 2021 totaling an estimated $44,707. The Company has obligations under certain coal transportation agreements that contain minimum quantities to be shipped during contract periods from 2020 through 2022 with estimated obligations based on remaining tons to be shipped totaling $29 and $338 in 2021 and 2022, respectively. The Company also has obligations under certain equipment purchase agreements that contain minimum quantities to be purchased in 2021 and 2023 totaling $5,008 and $170, respectively.
Contingencies
Extensive regulation of the impacts of mining on the environment and of maintaining workplace safety has had, and is expected to continue to have, a significant effect on the Company’s costs of production and results of operations. Further regulations, legislation or litigation in these areas may also cause the Company’s sales or profitability to decline by increasing costs or by hindering the Company’s ability to continue mining at existing operations or to permit new operations.
During the normal course of business, contract-related matters arise between the Company and its customers. When a loss related to such matters is considered probable and can reasonably be estimated, the Company records a liability.
Refer to Note 3 for disclosures on the Cumberland and PRB Back-to-Back Coal Supply Agreements.
Future Federal Income Tax Refunds
As of December 31, 2020, the Company has recorded $64,160 of current federal income tax receivable and associated interest receivable of $5,213 related to a net operating loss (“NOL”) carryback claim. Because the federal government was a creditor in the Alpha Natural Resources, Inc. bankruptcy proceedings, it is possible that the federal government could withhold some or all of the tax refund attributable to the NOL carryback claim and assert a right to set off the tax refund and associated interest receivable against its prepetition bankruptcy claims.  

(c) Guarantees and Financial Instruments with Off-Balance Sheet Risk
In the normal course of business, the Company is a party to certain guarantees and financial instruments with off-balance sheet risk, such as bank letters of credit, performance or surety bonds, and other guarantees and indemnities related to the obligations of affiliated entities which are not reflected in the Company’s Consolidated Balance Sheets. However, the underlying liabilities that they secure, such as asset retirement obligations, workers’ compensation liabilities, and royalty obligations, are reflected in the Company’s Consolidated Balance Sheets.

The Company is required to provide financial assurance in order to perform the post-mining reclamation required by its mining permits, pay workers’ compensation claims under workers’ compensation laws in various states, pay federal black lung benefits, and perform certain other obligations. In order to provide the required financial assurance, the Company generally uses surety bonds for post-mining reclamation and workers’ compensation obligations. The Company can also use bank letters of credit to collateralize certain obligations.
As of December 31, 2020, the Company had $123,108 in letters of credit outstanding under the Amended and Restated Asset-Based Revolving Credit Agreement. Additionally, as of December 31, 2020, the Company had $14,242 in letters of credit outstanding under the Amended and Restated Letter of Credit Agreement dated November 9, 2018 between ANR, Inc. and Citibank, N.A. and $613 in letters of credit outstanding under the Credit and Security Agreement dated June 30, 2017, and related amendments, between ANR, Inc. and First Tennessee Bank National Association.

As of December 31, 2020, the Company had outstanding surety bonds with a total face amount of $351,596 to secure various obligations and commitments, including $134,162 attributable to discontinued operations. To secure the Company’s reclamation-related obligations, the Company currently has $56,311 of collateral supporting these obligations.

The Company meets frequently with its surety providers and has discussions with certain providers regarding the extent of and the terms of their participation in the program. These discussions may cause the Company to shift surety bonds between providers or to alter the terms of their participation in our program. To the extent that surety bonds become unavailable or the Company’s surety bond providers require additional collateral, the Company would seek to secure its obligations with letters of credit, cash deposits or other suitable forms of collateral. The Company’s failure to maintain, or inability to acquire, surety bonds or to provide a suitable alternative would have a material adverse effect on its liquidity. These failures could result from a variety of factors including lack of availability, higher cost or unfavorable market terms of new surety bonds, and the exercise by third-party surety bond issuers of their right to refuse to renew the surety.

Amounts included in restricted cash represent cash deposits primarily invested in interest bearing accounts that are restricted as to withdrawal as required by certain agreements entered into by the Company and provide collateral to secure the following obligations which have been written on the Company’s behalf:

December 31, 2020December 31, 2019
Workers’ compensation and black lung obligations$69,725 $51,650 
Reclamation-related obligations8,445 67,868 
Financial payments and other performance obligations17,863 3,006 
Contingent revenue obligation escrow9,311 12,363 
Total restricted cash105,344 134,887 
Less current portion (1)
(9,311)(12,363)
Restricted cash, net of current portion$96,033 $122,524 
(1) Included within prepaid expenses and other current assets on the Company’s Consolidated Balance Sheets.

Restricted investments consist of FDIC insured certificates of deposit, mutual funds, and U.S. treasury bills that are restricted as to withdrawal as required by certain agreements entered into by the Company and provide collateral to secure the following obligations which have been written on the Company’s behalf:

December 31, 2020December 31, 2019
Workers’ compensation obligations$51 $613 
Reclamation-related obligations22,233 18,786 
Financial payments and other performance obligations1,484 — 
Total restricted investments (1), (2)
$23,768 $19,399 
(1) Included within other non-current assets on the Company’s Consolidated Balance Sheets.
(2) As of December 31, 2020 and 2019, respectively, $22,498 and $11,021 are classified as trading securities and $1,270 and $8,378 are classified as held-to-maturity securities.

Deposits represent cash deposits held at third parties as required by certain agreements entered into by the Company to provide cash collateral to secure the following obligations which have been written on the Company’s behalf:
December 31, 2020December 31, 2019
Reclamation-related obligations$25,633 $8,887 
Financial payments and other performance obligations1,596 — 
Other operating agreements1,018 1,423 
Total deposits (1)
$28,247 $10,310 
(1) Included within prepaid expenses and other current assets and other non-current assets on the Company’s Consolidated Balance Sheets.

DCMWC Reauthorization Process

In July 2019, the U.S. Department of Labor (Division of Coal Mine Workers’ Compensation or “DCMWC”) began implementing a new authorization process for all self-insured coal mine operators. As requested by the DCMWC, the Company filed an application and supporting documentation for reauthorization to self-insure certain of its black lung obligations in October 2019. As a result of this application, the DCMWC notified the Company in a letter dated February 21, 2020 that the Company was reauthorized to self-insure certain of its black lung obligations for a period of one-year from February 21, 2020. The DCMWC reauthorization is contingent, however, upon the Company’s providing collateral of $65,700 to secure certain of its black lung obligations. This proposed collateral requirement is an increase from the approximate $2,600 in collateral that the Company currently provides to secure these self-insured black lung obligations. The reauthorization process provided the Company with the right to appeal the security determination in writing within 30 days of the date of the notification, which appeal period the DCMWC agreed to extend to May 22, 2020. The Company exercised this right of appeal in connection with the substantial increase in the amount of required collateral. If the Company’s appeal is unsuccessful, the Company may be required to provide additional letters of credit to receive the self-insurance reauthorization from the DCMWC or alternatively insure these black lung obligations through a third party provider that would likely also require the Company to provide collateral. Either of these outcomes could potentially reduce the Company’s liquidity.

(d) Legal Proceedings 

The Company is party to legal proceedings from time to time. These proceedings, as well as governmental examinations, could involve various business units and a variety of claims including, but not limited to, contract disputes, personal injury claims, property damage claims (including those resulting from blasting, trucking and flooding), environmental and safety issues, securities-related matters and employment matters. While some legal matters may specify the damages claimed by the plaintiffs, many seek an unquantified amount of damages. Even when the amount of damages claimed against the Company or its subsidiaries is stated, (i) the claimed amount may be exaggerated or unsupported; (ii) the claim may be based on a novel legal theory or involve a large number of parties; (iii) there may be uncertainty as to the likelihood of a class being certified or the ultimate size of the class; (iv) there may be uncertainty as to the outcome of pending appeals or motions; and/or (v) there may be significant factual issues to be resolved. As a result, if such legal matters arise in the future, the Company may be unable to estimate a range of possible loss for matters that have not yet progressed sufficiently through discovery and development of important factual information and legal issues. The Company records accruals based on an estimate of the ultimate outcome of these matters, but these estimates can be difficult to determine and involve significant judgment.
v3.20.4
Concentration of Credit Risk and Major Customers
 12 Months Ended
Dec. 31, 2020
Risks and Uncertainties [Abstract]  
Concentration of Credit Risk and Major Customers Concentration of Credit Risk and Major Customers The Company markets produced, processed, and purchased coal to customers in the United States and in international markets, primarily India, Brazil, Turkey, the Netherlands, and Italy. The following table presents additional information on our total revenues and top customers:
Year Ended December 31,
 20202019
Total revenue$1,416,187 $2,001,280 
Top customer as % of total revenue 16 %13 %
Top 10 customers as % of total revenue 63 %59 %
Number of customers exceeding 10% of total revenue2 2 
Number of customers exceeding 10% of total trade accounts receivable, net3 3 
Domestic revenue as % of coal revenue 36 %39 %
Export revenue as % of coal revenue 64 %61 %
Countries with export revenue exceeding 10% of total revenue India, BrazilIndia
Met coal as % of coal sales volume80 %74 %
Thermal coal as % of coal sales volume20 %26 %
v3.20.4
Segment Information
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Segment Information Segment Information
The Company extracts, processes and markets met and thermal coal from deep and surface mines for sale to steel and coke producers, industrial customers, and electric utilities, The Company conducts mining operations only in the United States with mines in Central Appalachia. As of December 31, 2020, the Company has two reportable segments: Met and CAPP - Thermal. Met consists of five active mines and two preparation plants in Virginia, seventeen active mines and five preparation plants in West Virginia, as well as expenses associated with certain idled/closed mines. CAPP - Thermal consists of one active mine and one preparation plant in West Virginia, as well as expenses associated with certain idled/closed mines. Prior to the fourth quarter of 2020, the Company had three reportable segments: CAPP - Met, CAPP - Thermal, and NAPP. As a result of the divestiture of the Cumberland mining operations (refer to Note 3), the Company re-evaluated its previous conclusions with respect to its segment reporting during the period. To conform to the current period reportable segments presentation, the prior periods have been restated to reflect the change in reportable segments.
In addition to the two reportable segments, the All Other category includes general corporate overhead and corporate assets and liabilities, idle and closed mine costs, and the elimination of certain intercompany activity.
The operating results of these reportable segments are regularly reviewed by the “CODM,” who is the Chief Executive Officer of the Company.
Segment operating results and capital expenditures from continuing operations for the year ended December 31, 2020 were as follows: 
Year Ended December 31, 2020
MetCAPP - ThermalAll OtherConsolidated
Total revenues$1,264,496 $149,037 $2,654 $1,416,187 
Depreciation, depletion, and amortization$124,060 $20,453 $(4,628)$139,885 
Amortization of acquired intangibles, net$12,889 $(3,775)$100 $9,214 
Adjusted EBITDA$120,281 $9,853 $(46,732)$83,402 
Capital expenditures$111,745 $7,106 $728 $119,579 
Segment operating results and capital expenditures from continuing operations for the year ended December 31, 2019 were as follows: 
Year Ended December 31, 2019
MetCAPP - ThermalAll OtherConsolidated
Total revenues$1,711,260 $286,486 $3,534 $2,001,280 
Depreciation, depletion, and amortization$152,835 $57,483 $5,439 $215,757 
Amortization of acquired intangibles, net$10,389 $(13,578)$— $(3,189)
Adjusted EBITDA$316,006 $11,981 $(63,883)$264,104 
Capital expenditures$140,250 $17,545 $2,652 $160,447 

The following table presents a reconciliation of net loss from continuing operations to Adjusted EBITDA for the year ended December 31, 2020:
Year Ended December 31, 2020
MetCAPP - ThermalAll OtherConsolidated
Net loss from continuing operations$(77,519)$(52,520)$(111,431)$(241,470)
Interest expense(2,014)6 76,536 74,528 
Interest income(63)— (6,964)(7,027)
Income tax benefit— — (2,164)(2,164)
Depreciation, depletion and amortization124,060 20,453 (4,628)139,885 
Non-cash stock compensation expense289 8 4,600 4,897 
Mark-to-market adjustment - acquisition-related obligations— — (8,750)(8,750)
Accretion on asset retirement obligations14,214 9,285 3,005 26,504 
Asset impairment and restructuring (1)
46,317 36,719 842 83,878 
Management restructuring costs (2)
501 5 435 941 
Loss on partial settlement of benefit obligations1,607 (328)1,687 2,966 
Amortization of acquired intangibles, net12,889 (3,775)100 9,214 
Adjusted EBITDA $120,281 $9,853 $(46,732)$83,402 
(1) Asset impairment and restructuring for the year ended December 31, 2020 includes long-lived asset impairments of $80,954 and restructuring expense of $2,924. Refer to Note 8 for further information.
(2) Management restructuring costs are related to severance expense associated with senior management changes during the three months ended March 31, 2020.
The following table presents a reconciliation of net income (loss) from continuing operations to Adjusted EBITDA for the year ended December 31, 2019:
Year Ended December 31, 2019
MetCAPP - ThermalAll OtherConsolidated
Net income (loss) from continuing operations$7,944 $(97,398)$(130,164)$(219,618)
Interest expense(1,209)23 68,707 67,521 
Interest income(100)— (7,147)(7,247)
Income tax benefit— — (53,287)(53,287)
Depreciation, depletion and amortization152,835 57,483 5,439 215,757 
Merger-related costs— — 1,090 1,090 
Non-cash stock compensation expense1,494 71 10,783 12,348 
Mark-to-market adjustment - acquisition-related obligations— — (3,564)(3,564)
Accretion on asset retirement obligations9,599 10,929 3,337 23,865 
Loss on modification and extinguishment of debt— — 26,459 26,459 
Asset impairment (1)
15,034 50,993 297 66,324 
Goodwill impairment (2)
124,353 — — 124,353 
Cost impact of coal inventory fair value adjustment (3)
4,751 3,458 — 8,209 
Gain on assets acquired in an exchange transaction (4)
(9,083)— — (9,083)
Management restructuring costs (5)
— — 7,720 7,720 
Loss on partial settlement of benefit obligations(1)— 6,447 6,446 
Amortization of acquired intangibles, net10,389 (13,578)— (3,189)
Adjusted EBITDA $316,006 $11,981 $(63,883)$264,104 
(1) Asset impairment for the year ended December 31, 2019 includes a long-lived asset impairment of $60,169 related to asset groups recorded within the Met and CAPP - Thermal reporting segments and an asset impairment of $6,155 primarily related to the write-off of prepaid purchased coal as a result of Blackjewel’s Chapter 11 bankruptcy filing on July 1, 2019. Refer to Note 8 for further information.
(2) The goodwill impairment testing as of December 31, 2019 resulted in a goodwill impairment of $124,353 to write down the full carrying value of goodwill. Refer to Note 2 for further information.
(3) The cost impact of the coal inventory fair value adjustment as a result of the Merger was completed during the three months ended June 30, 2019.
(4) During the year ended December 31, 2019, the Company entered into an exchange transaction which primarily included the release of the PRB overriding royalty interest owed to the Company in exchange for met coal reserves which resulted in a gain of $9,083.
(5) Management restructuring costs are related to severance expense associated with senior management changes in the year ended December 31, 2019.

No asset information has been provided for these reportable segments as the CODM does not regularly review asset information by reportable segment.
v3.20.4
Summary of Significant Accounting Policies (Policies)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Basis of Presentation
Basis of Presentation

Together, the consolidated balance sheet and consolidated statements of operations, comprehensive loss, cash flows and stockholders’ equity for the Company are referred to as the “Financial Statements.” The Financial Statements are also referred to as “Consolidated” and references across periods are generally labeled “Balance Sheets,” “Statements of Operations,” and “Statements of Cash Flows.”
The Consolidated Financial Statements include all wholly owned subsidiaries’ results of operations for the years ended December 31, 2020 and 2019. All significant intercompany transactions have been eliminated in consolidation.

On December 10, 2020, the Company closed on a transaction with Iron Senergy Holdings, LLC, to sell its thermal coal mining operations located in Pennsylvania consisting primarily of our Cumberland mining complex and related property (the Company’s former Northern Appalachia (“NAPP”) operations). On December 8, 2017, the Company closed a transaction with Blackjewel L.L.C. to sell the Eagle Butte and Belle Ayr mines located in the Powder River Basin (“PRB”), Wyoming, along with related coal reserves, equipment, infrastructure and other real properties. Refer to Note 3 for information related to Blackjewel L.L.C.’s subsequent bankruptcy filing and the related ESM transaction. The Company’s former NAPP and PRB operations results of operations and financial position are reported as discontinued operations in the Consolidated Financial Statements. The historical information in the accompanying Notes 2, 3, 4, 6, 7, 9, 10, 11, 12, 14, 15, 17, 18, 19, 20, 23, 24, and 25 to the Consolidated Financial Statements has been restated to reflect the effects of the former NAPP and PRB operations being reported as discontinued operations in the Consolidated Financial Statements. Refer to Note 3 for further information on discontinued operations.
The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”).
Use of Estimates
Use of Estimates

The preparation of the Company’s Consolidated Financial Statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period. Significant items subject to such estimates and assumptions include inventories; mineral reserves; asset impairments; goodwill impairment; reclamation obligations; post-employment and other employee benefit obligations; useful lives, depletion and amortization; reserves for workers’ compensation and black lung claims; deferred income taxes; income taxes refundable and receivable; reserves for contingencies and litigation; fair value of financial instruments; and fair value adjustments for acquisition accounting. Estimates are based on facts and circumstances believed to be reasonable at the time; however, actual results could differ from those estimates.
Cash and Cash Equivalents
Cash and Cash Equivalents

 Cash and cash equivalents consist of cash held with reputable depository institutions and highly liquid, short-term investments with original maturities of three months or less. Cash and cash equivalents are stated at cost, which approximates fair value. As of December 31, 2020 and December 31, 2019, the Company’s cash equivalents of $139,227 and $212,803, respectively, consisted of highly-rated money market funds.
Restricted Cash Restricted CashAmounts included in restricted cash represent cash deposits that are restricted as to withdrawal as required by certain agreements entered into by the Company and provide collateral in the amounts of $69,725, $8,445, and $17,863 as of December 31, 2020 to secure workers’ compensation and black lung obligations, reclamation-related obligations, and financial payments and other performance obligations, respectively, which have been written on the Company’s behalf. As of December 31, 2019, collateral was provided in the amounts of $51,650, $67,868, and $3,006 to secure workers’ compensation and black lung obligations, reclamation-related obligations, and financial payments and other performance obligations, respectively, which have been written on the Company’s behalf. The Company’s restricted cash is primarily invested in interest-bearing accounts. This restricted cash is classified as long-term on the Company’s Consolidated Balance Sheets. Additionally, as of December 31, 2020 and 2019, the Company had $9,311 and $12,363, respectively, of short-term restricted cash held in escrow related to the Company’s contingent revenue payment obligation. Refer to Note 16 for further information regarding the contingent payment revenue obligation.
Restricted Investments
Restricted Investments

Restricted investments consist of Federal Deposit Insurance Company (“FDIC”) insured certificates of deposit, mutual funds, and U.S. treasury bills classified as either trading securities or held-to-maturity securities. Trading securities are recorded initially at cost and are adjusted to fair value at each reporting period with unrealized gains and recorded in current period earnings or loss. Held-to-maturity securities are recorded at amortized cost with interest income recorded in current period earnings. As of December 31, 2020, $22,498 and $1,270 were classified as trading and held-to-maturity securities, respectively. As of December 31, 2019, $11,021 and $8,378 were classified as trading and held-to-maturity securities, respectively. Given the nature of the underlying investments, the Company does not expect any credit losses and has not recorded any credit losses with respect to its held-to-maturity portfolio.

Restricted investments are restricted as to withdrawal by certain agreements and provide collateral in the amounts of $51, $22,233, and $1,484 as of December 31, 2020 to secure workers’ compensation obligations, reclamation-related obligations, and financial payments and other performance obligations, respectively. As of December 31, 2019, collateral was provided in the amounts of $613 and $18,786 to secure workers’ compensation obligations and reclamation-related obligations, respectively. These restricted investments are classified as long-term on the Company’s Consolidated Balance Sheets.
Deposits
Deposits

Deposits represent cash deposits held at third parties as required by certain agreements entered into by the Company to provide cash collateral. The Company had cash collateral in the form of deposits in the amounts of $25,633, $1,596, and $1,018 as of December 31, 2020 to secure reclamation-related obligations, financial payments and other performance obligations, and various other operating agreements, respectively. The Company had cash collateral in the form of deposits in the amounts of $8,887 and $1,423 as of December 31, 2019 to secure the Company’s obligations under reclamation-related obligations and various other operating agreements, respectively. These deposits are classified as both short-term and long-term on the Company’s Consolidated Balance Sheets.
Trade Accounts Receivable and Allowance for Doubtful Accounts
Trade Accounts Receivable and Allowance for Doubtful Accounts

Trade accounts receivable are recorded at their invoiced amounts and do not bear interest. The Company markets its coal primarily to domestic and international steel producers and electric utilities in the United States. Credit is extended based on an evaluation of a customer’s financial condition, including a review of third-party credit score information. Collateral is generally not required. Accounts receivable balances are monitored against approved credit limits. Credit limits are monitored and adjusted as considered necessary based on changes to a customer’s credit profile. If a customer’s credit deteriorates, the Company may reduce credit risk exposure by reducing credit limits, obtaining letters of credit, obtaining credit insurance, or requiring pre-payment for shipments. Credit losses have historically not been material. Account balances are written-off against
the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. Refer to Note 24 for further information.
Inventories
Inventories

Coal is reported as inventory at the point in time the coal is extracted from the mine. Raw coal represents coal stockpiles that may be sold in current condition or may be further processed prior to shipment to a customer. Saleable coal represents coal stockpiles that require no further processing prior to shipment to a customer.

Coal inventories are valued at the lower of average cost or net realizable value. The cost of coal inventories is determined based on the average cost of production, which includes labor, supplies, equipment costs, operating overhead, depreciation, and other related costs. Net realizable value considers the projected future sales price of the product, less estimated preparation and selling costs.

Material and supplies inventories are valued at average cost, less an allowance for obsolete and surplus items.
Discontinued Operations
Discontinued Operations

In accordance with Accounting Standards Codification (“ASC”) 205-20-45, the Company treats a disposal transaction as a discontinued operation when the disposal of a component or group of components represents a strategic shift that will have a major effect on the Company’s operations and financial results. In the period in which the discontinued operations criteria are met, the assets and liabilities of the discontinued operations are separately presented on the Company's Consolidated Balance Sheets and the results of operations, including any gain or loss recognized, is reclassified to discontinued operations on the Company’s Consolidated Statement of Operations. Refer to Note 3 for further information on discontinued operations.
Deferred Longwall Move Expenses Deferred Longwall Move ExpensesThe Company deferred the direct costs, including labor and supplies, associated with moving longwall equipment, the related equipment refurbishment costs, costs to drill vent holes and plug existing gas wells in advance of the longwall panel associated with its former NAPP operations included in discontinued operations of the Consolidated Balance Sheets as of December 31, 2020 and 2019. Refer to Note 3. These deferred costs were amortized on a units-of-production basis into cost of coal sales over the life of the related panel of coal mined by the longwall equipment.
Advanced Mining Royalties
Advanced Mining Royalties

Lease rights to coal reserves are often acquired in exchange for royalty payments. Advance mining royalties are advance payments made to lessors under terms of mineral lease agreements that are recoupable against future production royalties. These advance payments are deferred and charged to operations as the coal reserves are mined. The Company regularly reviews recoverability of advance mining royalties and establishes or adjusts the allowance for advance mining royalties as necessary using the specific identification method. Advance royalty balances are generally charged off against the allowance when they are no longer recoupable.
Property, Plant and Equipment, Net Property, Plant, and Equipment, Net Costs for mine development incurred to expand capacity of operating mines or to develop new mines are capitalized and charged to operations on the units-of-production method over the estimated proven and probable reserve tons directly benefiting from the capital expenditures. Mine development costs include costs incurred for site preparation and development of the mines during the development stage less any incidental revenue generated during the development stage. Mining equipment, buildings and other fixed assets are stated at cost and depreciated on a straight-line basis over estimated useful lives ranging from one to 25 years. Leasehold improvements are amortized using the straight-line method, over the shorter of the estimated useful lives or term of the lease. Major repairs and betterments that significantly extend original useful lives or improve productivity are capitalized and depreciated over the period benefited. Maintenance and repairs are expensed as incurred. When equipment is retired or disposed, the related cost and accumulated depreciation are removed from the respective accounts and any profit or loss on disposal is recognized in other (income) expense in the Company’s Consolidated Statements of Operations. Costs to obtain owned and leased mineral rights are capitalized and amortized to operations as depletion expense using the units-of-production method. Only proven and probable reserves are included in the depletion base.
Owned and Leased Mineral Rights Costs to obtain owned and leased mineral rights are capitalized and amortized to operations as depletion expense using the units-of-production method. Only proven and probable reserves are included in the depletion base.
Leases LeasesIn accordance with ASC 842, the Company recognizes right of use assets and lease liabilities on the balance sheet for all leases with a term longer than 12 months. Some of these leases include both lease and non-lease components which are accounted for as a single lease component as the Company has elected the practical expedient to combine these components for all leases. The discount rates used to determine the present value of the lease assets and liabilities are based on the Company’s incremental borrowing rate at the lease commencement date and commensurate with the remaining lease term. As the rates implicit in most of the Company’s leases are not readily determinable, the Company uses a collateralized incremental borrowing rate based on the information available at the lease commencement date in determining the present value of future payments. The Company uses the portfolio approach and group leases by short-term and long-term categories, applying the corresponding incremental borrowing rates to these categories of leases. For leases with a term of 12 months or less, no right of use assets or liabilities are recognized on the balance sheet and the Company recognizes the lease expense on a straight-line basis over the lease term. Additionally, the Company recognizes variable lease payments as an expense in the period incurred.
Acquired Intangibles
Acquired Intangibles

The Company has recognized assets for acquired above market-priced coal supply agreements and acquired mine permits and liabilities for acquired below market-priced coal supply agreements. The coal supply agreements were valued based on the present value of the difference between the expected net contractual cash flows based on the stated contract terms, and the estimated net contractual cash flows derived from applying forward market prices at the Merger or acquisition date for new contracts of similar terms and conditions. The acquired mine permits were valued based on the replacement cost and lost profits method as of the Merger date. The balances and respective balance sheet classifications of such assets and liabilities as of December 31, 2020 and 2019, net of accumulated amortization, are set forth in the following tables:
December 31, 2020
Assets (1)
Liabilities (2)
Net Total
Coal supply agreements, net$— $(327)$(327)
Acquired mine permits, net88,196 — 88,196 
Total$88,196 $(327)$87,869 
December 31, 2019
Assets (1)
Liabilities (2)
Net Total
Coal supply agreements, net$18 $(6,018)$(6,000)
Acquired mine permits, net124,228 — 124,228 
Total$124,246 $(6,018)$118,228 
(1) Included within other acquired intangibles, net of accumulated amortization, on the Company’s Consolidated Balance Sheets.
(2) Included within other non-current liabilities on the Company’s Consolidated Balance Sheets.

During the years ended December 31, 2020 and 2019, the Company recorded long-lived asset impairments which reduced the carrying value of acquired mine permits, net, by $21,144 and $5,997. Refer to Note 8 for further information.

The acquired mine permits are amortized over the estimated life of the associated mine. The coal supply agreement assets and liabilities are amortized over the actual number of tons shipped over the life of each contract. The following table details the amortization of mine permits acquired as a result of the Merger and the amortization of above-market and below-market coal supply agreements.
December 31,
20202019
Amortization of mine permits (1)
$14,887 $23,921 
Amortization of above-market coal supply agreements$18 $783 
Amortization of below-market coal supply agreements(5,691)(27,893)
Net income (1)
$(5,673)$(27,110)
(1) Included within amortization of acquired intangibles, net in the Consolidated Statements of Operations.
Goodwill
Goodwill

Goodwill represents the excess of the purchase price over the fair value of the net identifiable tangible and intangible assets of acquired companies. In connection with the Merger in 2018, the Company recorded goodwill of $124,353 and allocated it to the Met reportable segment. Goodwill is not amortized; instead, it is tested for impairment annually as of October 31 of each year or more frequently if indicators of impairment exist.

The Company performed an interim goodwill impairment test as of August 31, 2019 due to a decline in the Company’s market capitalization to amounts below book value combined with a decline in global metallurgical coal pricing which indicated that the fair value of the Met segment reporting unit may have been below its carrying value. Following the quantitative testing, the Company concluded that the fair value of the reporting unit exceeded its carrying value and no amount of goodwill was impaired. As of October 31, 2019, the Company performed its annual goodwill impairment test and concluded that more likely than not the fair value of its Met reporting unit to which the Company’s goodwill is allocated exceeded its carrying value. As a result, no amount of goodwill was considered impaired as a result of impairment testing at October 31, 2019.
However, due to the continued weakening in coal market pricing combined with a significant market price decline for the Company’s stock late in the fourth quarter of 2019, the Company performed an interim goodwill impairment test as of December 31, 2019. Following the quantitative testing, the Company concluded that the carrying value of the Met reporting unit exceeded its fair value and recorded a goodwill impairment of $124,353 to write down the full carrying amount of goodwill.

The Company early adopted Accounting Standards Update (“ASU”) 2017-04 for the period ended December 31, 2017, which eliminated Step 2 of the quantitative goodwill impairment test. The Company first assesses goodwill for impairment on a qualitative basis. If the Company determines that more likely than not the fair value of a reporting unit containing goodwill exceeds its carrying amount, no further impairment testing is required. If the qualitative assessment indicates that an impairment potentially exists, then the Company quantitatively tests goodwill for impairment by comparing the fair value of the reporting unit to its carrying amount. If the fair value of the reporting unit is lower than its carrying amount, its goodwill is written down by the lesser of the amount by which the reporting units carrying amount exceeded its fair value or its carrying amount of goodwill.

The valuation methodology utilized to estimate the fair value of the reporting units is based on both a market and income approach and is within the range of fair values yielded under each approach. The income approach is based on a discounted cash flow methodology based on estimates of future sales volumes, coal prices, production costs, and a risk-adjusted cost of capital. These estimates generally constitute unobservable Level 3 inputs under the fair value hierarchy. The market approach is based on a guideline company and similar transaction methodology. Under the guideline company approach, certain metrics from a selected group of publicly traded guideline companies that have similar operations to the Company’s reporting units are used to estimate the fair value of the reporting units. Under the similar transactions approach, recent merger and acquisition transactions for companies that have similar operations to the Company’s reporting units are used to estimate the fair value of the Company’s reporting units.

The following table summarizes the changes in goodwill for the year ended December 31, 2019:

Balance as of December 31, 2018
Measurement-Period Adjustments (2)
ImpairmentsBalance as of December 31, 2019
Goodwill (1)
$95,624 $28,729 $(124,353)$— 
(1) There was no goodwill activity during the year ended December 31, 2020.
(2) Prior to the finalization of the Merger purchase price allocation, the Company recorded measurement-period adjustments to the provisional opening balance sheet primarily to property, plant, and equipment, owned and leased mineral rights, asset retirement obligations, and certain actuarial liabilities.
Asset Impairment
Asset Impairment

Long-lived assets, such as property, plant, and equipment, mineral rights, and acquired intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset groups may not be recoverable. Recoverability of assets or asset groups to be held and used is measured by a comparison of the carrying amount of an asset or asset group to the estimated undiscounted future cash flows expected to be generated by the asset or asset group. Long-lived assets located in a close geographic area are grouped together for purposes of impairment testing when, after considering revenue and cost interdependencies, circumstances indicate the assets are used together to produce future cash flows. The Company’s asset groups generally consist of the assets and applicable liabilities of one or more mines and preparation plants and associated coal reserves for which cash flows are largely independent of cash flows of other mines, preparation plants, and associated coal reserves. If the carrying amount of an asset or asset group exceeds its estimated future cash flows, the potential impairment is equal to the amount by which the carrying amount of the asset or asset group exceeds the fair value of the asset or asset group. The Company estimates the fair value of an asset group generally using discounted cash flow analysis based on estimates of future sales volumes, coal prices, production costs, and a risk-adjusted cost of capital. These estimates generally constitute unobservable Level 3 inputs under the fair value hierarchy. The amount of impairment, if any, is allocated to the long-lived assets on a pro-rata basis, except that the carrying value of the individual long-lived assets are not reduced below their estimated fair value. Refer to Note 8.
Asset Retirement Obligations Asset Retirement ObligationsMinimum standards for mine reclamation have been established by various regulatory agencies and dictate the reclamation requirements at the Company’s operations. The Company’s asset retirement obligations consist principally of costs to reclaim acreage disturbed at surface operations and estimated costs to reclaim support acreage, treat mine water discharge, and perform other related functions at underground mines. The Company records these reclamation obligations at fair value in the period in which the legal obligation associated with the retirement of the long-lived asset is incurred. Changes to the liability at operations that are not currently being reclaimed are offset by increasing or decreasing the carrying amount of the related long-lived asset. Changes to the liability at operations that are currently being reclaimed are recorded to depreciation, depletion, and amortization. Over time, the liability is accreted and any capitalized cost is depreciated or depleted over the useful life of the related asset. To settle the liability, the obligation is paid, and to the extent there is a difference between the liability and the amount of cash paid, a gain or loss upon settlement is recorded. The Company annually reviews its estimated future cash flows for its asset retirement obligations. Refer to Note 17 for further disclosures related to asset retirement obligations.
Income Taxes Income TaxesThe Company recognizes deferred tax assets and liabilities using enacted tax rates for the effect of temporary differences between the book and tax basis of recorded assets and liabilities. Deferred tax assets are reduced by a valuation allowance if it is more likely than not that some portion or all of the deferred tax asset will not be realized. In evaluating its ability to recover deferred tax assets within the jurisdiction in which they arise, the Company considers all available positive and negative evidence, including the expected reversals of taxable temporary differences, projected future taxable income, taxable income available via carryback to prior years, tax planning strategies, and results of recent operations. The Company assesses the realizability of its deferred tax assets, including scheduling the reversal of its deferred tax assets and liabilities, to determine the amount of valuation allowance needed. Scheduling the reversal of deferred tax asset and liability balances requires judgment and estimation. The Company believes that the deferred tax liabilities relied upon as future taxable income in its assessment will reverse in the same period and jurisdiction and are of the same character as the temporary differences giving rise to the deferred tax assets that will be realized.
Deferred Financing Costs Deferred Financing CostsThe costs to obtain new debt financing or amend existing financing agreements are generally deferred and amortized to interest expense over the life of the related indebtedness or credit facility using the effective interest method. Unamortized deferred financing costs are presented in the Consolidated Balance Sheet as a direct deduction from the carrying amount of the debt liability, consistent with debt discounts or premiums. Unamortized deferred financing costs associated with undrawn credit facilities are included in the Consolidated Balance Sheets within other non-current assets.
Revenue Recognition Revenue Recognition In accordance with ASC 606 Revenue from Contracts with Customers (“ASC 606”), the Company measures revenue based on the consideration specified in a contract with a customer and recognizes revenue as a result of satisfying its promise to transfer goods or services in a contract with a customer using the following general revenue recognition five-step model: (1) identify the contract; (2) identify performance obligations; (3) determine transaction price; (4) allocate transaction price; and (5) recognize revenue. Freight and handling costs paid to third-party carriers and invoiced to coal customers are recorded as freight and handling costs and freight and handling fulfillment revenues within cost of coal sales and coal revenues, respectively.
Workers' Compensation and Pneumoconiosis (Black Lung) Benefits, Pension and Life Insurance Benefits
Workers’ Compensation and Pneumoconiosis (Black Lung) Benefits 

Workers’ Compensation

As of December 31, 2020, the Company’s subsidiaries generally utilize high-deductible insurance programs for workers’ compensation claims at its operations with the exception of certain subsidiaries in which the Company is a qualified self-insurer
for workers’ compensation obligations. The liabilities for workers’ compensation claims are estimates of the ultimate losses incurred based on the Company’s experience and include a provision for incurred but not reported losses. Adjustments to the probable ultimate liabilities are made annually based on an actuarial study and adjustments to the liability are recorded based on the results of this study. These short-term and long-term obligations are included in the Consolidated Balance Sheets within accrued expenses and other current liabilities and workers’ compensation and black lung obligations, respectively, with an offsetting insurance receivable within prepaid expenses and other current assets and other non-current assets. As of December 31, 2020 and 2019, the workers’ compensation liability was net of a discount of $24,061 and $24,680, respectively, related to fair value adjustments associated with acquisition accounting. Refer to Note 20 for further disclosures related to workers’ compensation.

Black Lung Benefits

The Company is required by federal and state statutes to provide benefits to employees for awards related to black lung. As of December 31, 2020, certain of the Company’s subsidiaries are insured for black lung obligations by a third-party insurance provider and certain subsidiaries are self-insured for state black lung obligations. Certain other subsidiaries are self-insured for federal black lung benefits and may fund benefit payments through a Section 501(c)(21) tax-exempt trust fund. Charges are made to operations for black lung claims, as determined by an independent actuary at the present value of the actuarially computed liability for such benefits over the employee’s applicable term of service. The Company recognizes in its balance sheet the amount of the Company’s unfunded Accumulated Benefit Obligation (“ABO”) at the end of the year. Amounts recognized in accumulated other comprehensive income (loss) are adjusted out of accumulated other comprehensive income (loss) when they are subsequently recognized as components of net periodic benefit cost. These short-term and long-term obligations are included in the Consolidated Balance Sheets within accrued expenses and other current liabilities and workers’ compensation and black lung obligations, respectively. Refer to Note 20 for further disclosures related to black lung benefits.

Pension

The Company is required to recognize the overfunded or underfunded status of a defined benefit pension plan as an asset or liability in its Consolidated Balance Sheets and to recognize changes in that funded status in the year in which the changes occur through other comprehensive (loss) income. The Company is required to measure plan assets and benefit obligations as of the date of the Company’s fiscal year-end Consolidated Balance Sheet and provide the required disclosures as of the end of each fiscal year. Refer to Note 20 for further disclosures related to pension.
Postretirement Life Insurance Benefits

As part of the Alpha Natural Resources, Inc. bankruptcy reorganization plan and the Retiree Committee Settlement Agreement, the Company assumed the liability for life insurance benefits for certain disabled and non-union retired employees. Provisions are made for estimated benefits based on annual evaluations prepared by independent actuaries. Adjustments to the probable ultimate liabilities are made annually based on an actuarial study and adjustments to the liability are recorded based on the results of this study. These obligations are included in the Consolidated Balance Sheet as accrued expenses and other current liabilities and other non-current liabilities. Refer to Note 20 for further disclosures related to postretirement life insurance benefits.
Net (Loss) Income Per Share
Net (Loss) Income per Share

 Basic net (loss) income per share is computed by dividing net (loss) income by the weighted-average number of outstanding common shares for the period. Diluted (loss) earnings per share reflects the potential dilution that could occur if instruments that may require the issuance of common shares in the future were settled and the underlying common shares were issued. Diluted (loss) earnings per share is computed by increasing the weighted-average number of outstanding common shares computed in basic (loss) earnings per share to include the additional common shares that would be outstanding after issuance and adjusting net (loss) income for changes that would result from the issuance. Only those securities that are dilutive are included in the calculation. In periods of loss, the number of shares used to calculate diluted earnings is the same as basic earnings per share. Refer to Note 6 for further disclosures related to net (loss) income per share.
Stock-Based Compensation
Stock-Based Compensation

The Company recognizes expense for stock-based compensation awards based on their grant-date fair value. The expense
is recorded over the respective service period of the underlying award. Liability classified stock-based compensation awards are remeasured each reporting period at fair value until the award is settled. The Company recognizes forfeitures of stock-based compensation awards as they occur. Refer to Note 21 for further disclosures related to stock-based compensation arrangements.
Warrants
Warrants

On July 26, 2016 (the “Initial Issue Date”), the Company issued 810,811 warrants, which are classified as equity instruments, each with an initial exercise price, as defined in the Series A Warrants Agreement (the “Warrants Agreement”), of $55.93 per share of common stock and exercisable for one share of the Alpha’s common stock, par value $0.01 per share. Pursuant to the Warrants Agreement, the warrants are exercisable for cash or on a cashless basis at any time from the Initial Issue Date until July 26, 2023, and no fractional shares shall be issued upon warrant exercises. The exercise price and the warrant share number will be adjusted in respect of certain dilutive events with respect to the common stock (namely, dividends or distributions on the common stock, share splits and combinations, above-market tender offers for common stock by the Company or a subsidiary thereof, and discounted issuances of common stock or rights or options to purchase common stock or securities convertible or exchangeable into common stock). Additionally, in the case of any reorganization (i.e., a consolidation, merger, or sale of all or substantially all of the consolidated assets of Alpha) pursuant to which the common stock is converted into cash, securities or other property, the warrants would become exercisable for such property. As of December 31, 2020 and 2019, the exercise price was $46.911 per share and the warrant share number was equal to 1.15, as adjusted in respect to certain diluted events with respect to the common stock during 2017 and 2018.
As of December 31, 2020 and 2019, of the 810,811 warrants that were originally issued, 801,370 remained outstanding, with a total of 921,576 shares underlying the un-exercised warrants. For the year ended December 31, 2020, there were no warrant exercises. For the year ended December 31, 2019, the Company issued 414 shares of common stock resulting from exercises of its Series A Warrants and, pursuant to the terms of the Warrants Agreement, withheld five of the issued shares in satisfaction of the warrant exercise price, which were subsequently reclassified as treasury stock.
Equity Method Investments Equity Method InvestmentsInvestments in unconsolidated affiliates that the Company has the ability to exercise significant influence over, but not control, are accounted for under the equity method of accounting. Under the equity method of accounting, the Company records its proportionate share of the entity’s net income or loss at each reporting period in the Consolidated Statements of Operations in other (expense) income, with a corresponding entry to increase or decrease the carrying value of the investment.
Recently Adopted Accounting Guidance and Recent Accounting Guidance Issued Not Yet Effective
Recently Adopted Accounting Guidance

Leases: In February 2016, the Financial Accounting Standards Board (the “FASB”) issued an Accounting Standards Update and subsequent amendments related to ASC 842, Leases, (“ASC 842”). ASC 842 requires a lessee to recognize a right-of-use asset and a lease liability on the balance sheet. The Company adopted ASC 842 effective January 1, 2019 and elected the option not to restate comparative periods in transition and also elected the hindsight practical expedient, which allows the Company to use hindsight when considering lessee options to extend or terminate leases when determining the lease term of lease arrangements for classification purposes, and the package of practical expedients for all leases within the standard, which permits the Company not to reassess its prior conclusions about lease identification, lease classification, and initial direct costs. Additionally, the Company elected the transition practical expedient to continue to account for existing and expired land easements at transition as executory contracts. Only land easements entered into or modified after the effective date of ASC 842 are accounted for as leases by the Company.

As a result of the adoption, the Company recorded operating lease right-of-use assets and lease liabilities on our Consolidated Balance Sheet. The following table summarizes the impact of the adoption of ASC 842 to the Company’s Consolidated Balance Sheet:
 Balance at December 31, 2018AdjustmentsBalance at January 1, 2019
AssetsBalance Sheet Classification 
Operating lease right-of-use assetsOther non-current assets$— $10,136 $10,136 
Financing lease assetsProperty, plant, and equipment, net9,786 — 9,786 
Total lease assets$9,786 $10,136 $19,922 
LiabilitiesBalance Sheet Classification
Operating lease liabilities - currentAccrued expenses and other current liabilities$— $3,232 $3,232 
Financing lease liabilities - currentCurrent portion of long-term debt2,110 — 2,110 
Operating lease liabilities - long-termOther non-current liabilities— 6,904 6,904 
Financing lease liabilities - long-termLong-term debt4,313 — 4,313 
Total lease liabilities$6,423 $10,136 $16,559 

The adoption of ASC 842 did not have a material impact on our Consolidated Statements of Operations, Consolidated Statements of Comprehensive Loss, or Consolidated Statements of Cash Flows. Refer to Note 12 for further disclosure requirements under the new standard.

Credit Losses: In June 2016, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2016-13, Credit Losses (“ASU 2016-13”). ASU 2016-13, along with related amendments and improvements issued in 2018 and 2019, replaces the previous incurred loss impairment methodology in U.S. GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable supportable information to inform credit loss estimates for financial instruments that are in the scope of this update, including trade accounts receivable. The Company adopted ASU 2016-13 during the first quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Consolidated Financial Statements and related disclosures and resulted in a cumulative-effect adjustment to retained earnings of $440 in the Consolidated Balance Sheet as of January 1, 2020.

Fair Value Measurement: In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820), Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement (“ASU 2018-13”). The amendments in this update modify the disclosure requirements for fair value measurements. The Company adopted ASU 2018-13 during the first quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Consolidated Financial Statements and related disclosures.

Income Taxes: In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”). The amendments in this update simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The amendments also improve consistent application of and simplify U.S. GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The Company adopted ASU 2019-12 during the first quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Consolidated Financial Statements and related disclosures.

Reference Rate Reform: In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of Effects of Reference Rate Reform on Financial Reporting (“ASU 2020-04”). The amendments in this update provide optional expedients and exceptions, if certain criteria are met, for applying U.S. GAAP to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The expedients and exceptions provided by the amendments do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. The Company adopted ASU 2020-04, with respect to topics in Accounting Standards Codification (“ASC”) 310 Receivables, ASC 470 Debt, ASC 815 Derivatives and Hedging and ASC 842 Leases, during the first quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Consolidated Financial Statements and related disclosures.

Defined Benefit Plans: In August 2018, the FASB issued ASU 2018-14, Compensation—Retirement Benefits—Defined
Benefit Plans—General (Subtopic 715-20) Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans (“ASU 2018-14”). The amendments in this update modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. For public business entities, the standard is effective for fiscal years ending after December 15, 2020. The Company adopted ASU 2018-14 during the fourth quarter of 2020. The adoption of this ASU did not have a material impact on the Company's Consolidated Financial Statements and related disclosures.

Recent Accounting Guidance Issued Not Yet Effective

Convertible Debt and Contracts in Entity’s Own Equity: In August 2020, the FASB issued ASU 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40) (“ASU 2020-06”). The amendments in this update simplify the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts in an entity’s own equity, such as the Company’s outstanding Series A warrants. For public business entities, the standard is effective for fiscal years beginning after December 15, 2021, with early adoption permitted. The adoption of this ASU is not expected to have a material impact on the Company’s Consolidated Financial Statements and related disclosures.
Liquidity Risks and Uncertainties
Liquidity Risks and Uncertainties

Weak market conditions and depressed coal prices have resulted in operating losses. If market conditions do not improve, the Company may experience continued operating losses and cash outflows in the coming quarters, which would adversely affect its liquidity. The Company may need to raise additional funds more quickly if market conditions deteriorate and may not be able to do so in a timely fashion, or at all. The Company believes it will have sufficient liquidity to meet its working capital requirements, anticipated capital expenditures, debt service requirements, acquisition-related obligations, and reclamation obligations for the 12 months subsequent to the issuance of these financial statements. The Company relies
on a number of assumptions in budgeting for future activities. These include the costs for mine development to sustain capacity of its operating mines, cash flows from operations, effects of regulation and taxes by governmental agencies, mining technology improvements and reclamation costs. These assumptions are inherently subject to significant business, political, economic, regulatory, environmental and competitive uncertainties, contingencies and risks, all of which are difficult to predict and many of which are beyond the Company’s control. Therefore, the cash on hand and from future operations will be subject to any significant changes in these assumptions.
v3.20.4
Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Schedule of Intangibles The balances and respective balance sheet classifications of such assets and liabilities as of December 31, 2020 and 2019, net of accumulated amortization, are set forth in the following tables:
December 31, 2020
Assets (1)
Liabilities (2)
Net Total
Coal supply agreements, net$— $(327)$(327)
Acquired mine permits, net88,196 — 88,196 
Total$88,196 $(327)$87,869 
December 31, 2019
Assets (1)
Liabilities (2)
Net Total
Coal supply agreements, net$18 $(6,018)$(6,000)
Acquired mine permits, net124,228 — 124,228 
Total$124,246 $(6,018)$118,228 
(1) Included within other acquired intangibles, net of accumulated amortization, on the Company’s Consolidated Balance Sheets.
(2) Included within other non-current liabilities on the Company’s Consolidated Balance Sheets.
The following table details the amortization of mine permits acquired as a result of the Merger and the amortization of above-market and below-market coal supply agreements.
December 31,
20202019
Amortization of mine permits (1)
$14,887 $23,921 
Amortization of above-market coal supply agreements$18 $783 
Amortization of below-market coal supply agreements(5,691)(27,893)
Net income (1)
$(5,673)$(27,110)
(1) Included within amortization of acquired intangibles, net in the Consolidated Statements of Operations.
Schedule of Future Amortization Expense
Future net amortization expense related to acquired intangibles is expected to be as follows:  
2021$9,712 
202210,039 
202310,028 
20248,677 
20258,672 
Thereafter40,741 
Total net future amortization expense$87,869 
Schedule of Changes in Goodwill
The following table summarizes the changes in goodwill for the year ended December 31, 2019:

Balance as of December 31, 2018
Measurement-Period Adjustments (2)
ImpairmentsBalance as of December 31, 2019
Goodwill (1)
$95,624 $28,729 $(124,353)$— 
(1) There was no goodwill activity during the year ended December 31, 2020.
(2) Prior to the finalization of the Merger purchase price allocation, the Company recorded measurement-period adjustments to the provisional opening balance sheet primarily to property, plant, and equipment, owned and leased mineral rights, asset retirement obligations, and certain actuarial liabilities.
Schedule of New Accounting Pronouncements and Changes in Accounting Principles The following table summarizes the impact of the adoption of ASC 842 to the Company’s Consolidated Balance Sheet:
 Balance at December 31, 2018AdjustmentsBalance at January 1, 2019
AssetsBalance Sheet Classification 
Operating lease right-of-use assetsOther non-current assets$— $10,136 $10,136 
Financing lease assetsProperty, plant, and equipment, net9,786 — 9,786 
Total lease assets$9,786 $10,136 $19,922 
LiabilitiesBalance Sheet Classification
Operating lease liabilities - currentAccrued expenses and other current liabilities$— $3,232 $3,232 
Financing lease liabilities - currentCurrent portion of long-term debt2,110 — 2,110 
Operating lease liabilities - long-termOther non-current liabilities— 6,904 6,904 
Financing lease liabilities - long-termLong-term debt4,313 — 4,313 
Total lease liabilities$6,423 $10,136 $16,559 
v3.20.4
Discontinued Operations (Tables)
 12 Months Ended
Dec. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]  
Discontinued Operations
The following table presents the details of the Cumberland Transaction:
Year Ended December 31, 2020
Cash$19,987 
Surety bonding collateral30,000 
Total consideration49,987 
Transaction costs2,205 
Carrying value of assets and liabilities (1)
$(16,079)
Loss on sale$36,113 
(1) Assets and liabilities were primarily comprised of property, plant and equipment, net of $32,872, deferred longwall move expenses of $15,173, and coal and supplies inventory of $5,112 and asset retirement obligations of $39,573, severance of $17,143, black lung obligations of $8,290, and subsidence liability of $3,559.
The following table presents the details of the ESM Transaction:
Year Ended December 31, 2019
Cash$90,000 
DIP obligation (1)
3,008 
Other331 
Total consideration$93,339 
ARO liabilities transferred(152,882)
Gain on sale (2)
$(59,543)
(1) The Company paid certain Blackjewel debtor-in-possession lenders $3,008 of principal and interest pursuant to an existing agreement between the Company and those lenders.
(2) The Company recorded a $59,543 gain within depreciation, depletion, and amortization within discontinued operations in the Consolidated Statements of Operations during the year ended December 31, 2019 as a result of the reduction of the reclamation obligation partially offset by the consideration paid.
The major components of net loss from discontinued operations before income taxes in the Consolidated Statements of Operations are as follows:
Year Ended December 31,
 
2020 (1)
2019
Revenues: 
Total revenues$235,509 $289,206 
Costs and expenses:
Cost of coal sales (exclusive of items shown separately below)215,390 256,336 
Depreciation, depletion and amortization (2)
11,570 99,405 
Accretion on asset retirement obligations (3)
4,154 9,894 
Asset impairment and restructuring (4)
172,640 17,161 
Selling, general and administrative expenses (5)
1,623 4,349 
Other (income) expenses(926)4,742 
Other non-major expense items, net374 2,504 
Loss on sale36,113 — 
Loss from discontinued operations before income taxes$(205,429)$(105,185)
(1) For the year ended December 31, 2020, discontinued operations consisted entirely of activity related to the former NAPP operations.
(2) During the year ended December 31, 2019, depreciation, depletion and amortization includes $145,913 related to an increase in the Company’s estimate of its PRB asset retirement obligations which was partially offset by ($59,543) as a result of the ESM transaction. Refer to the disclosures above for details.
(3) For the year ended December 31, 2019, the former PRB operations’ accretion on asset retirement obligations of $5,961 related to the asset retirement obligations recorded as a result of the Blackjewel bankruptcy filing. Refer to the disclosures above for details.
(4) Refer to Note 8.
(5) Represents professional and legal fees.
The major components of assets and liabilities that are classified as discontinued operations in the Consolidated Balance Sheets are as follows:
December 31,
2020
2019
Assets:  
Trade accounts receivable, net of allowance for doubtful accounts$7,504 $20,493 
Inventory, net$— $11,771 
Prepaid expenses and other current assets$3,431 $13,628 
Property, plant, and equipment, net of accumulated depreciation and amortization$— $146,864 
Other non-current assets$9,473 $15,760 
Liabilities:  
Trade accounts payable, accrued expenses and other current liabilities$7,433 $24,769 
Asset retirement obligations$— $21,568 
Workers’ compensation and black lung obligations$32,672 $36,149 
Other non-current liabilities$1,291 $4,593 

The major components of cash flows related to discontinued operations were as follows:
Year Ended December 31,
20202019
Depreciation, depletion and amortization$11,570 $99,405 
Capital expenditures$34,411 $31,964 
Other significant operating non-cash items related to discontinued operations:
Accretion on asset retirement obligations$4,154 $9,894 
Asset impairment and restructuring$172,640 $17,161 
v3.20.4
Revenue (Tables)
 12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue The following tables disaggregate the Company’s coal revenues by product category and by market to depict how the nature, amount, timing, and uncertainty of the Company’s coal revenues and cash flows are affected by economic factors:
Year Ended December 31, 2020
Met CoalThermal CoalTotal
Export coal revenues$870,121 $27,904 $898,025 
Domestic coal revenues362,654 152,445 515,099 
Total coal revenues$1,232,775 $180,349 $1,413,124 
Year Ended December 31, 2019
Met CoalThermal CoalTotal
Export coal revenues$1,174,942 $48,166 $1,223,108 
Domestic coal revenues551,806 221,020 772,826 
Total coal revenues$1,726,748 $269,186 $1,995,934 
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied as of December 31, 2020.
20212022202320242025Total
Estimated coal revenues (1)
$113,676 $28,000 $— $— $— $141,676 
(1) Amounts only include estimated coal revenues associated with contracts with customers with fixed pricing with original expected duration of more than one year. The Company has elected not to disclose the aggregate amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period for performance obligations with either of the following conditions: 1) the remaining performance obligation is part of a contract that has an original expected duration of one year or less; or 2) the remaining performance obligation has variable consideration that is allocated entirely to a wholly unsatisfied performance obligation.
v3.20.4
Accumulated Other Comprehensive (Loss) Income (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following tables summarize the changes to accumulated other comprehensive loss during the years ended December 31, 2020 and 2019:
Balance January 1, 2020Other comprehensive loss before reclassificationsAmounts reclassified from accumulated other comprehensive lossBalance December 31, 2020
Employee benefit costs$(58,616)$(60,647)$7,278 $(111,985)
Balance January 1, 2019
Other comprehensive loss before reclassificationsAmounts reclassified from accumulated other comprehensive loss
Balance December 31, 2019
Employee benefit costs$(23,130)$(42,891)$7,405 $(58,616)

The following table summarizes the amounts reclassified from accumulated other comprehensive loss and the Consolidated Statements of Operations line items affected by the reclassification during the years ended December 31, 2020 and 2019:
Details about accumulated other comprehensive loss componentsAmounts reclassified from accumulated other comprehensive lossAffected line item in the Consolidated Statements of Operations
Year Ended December 31,
20202019
Employee benefit costs:
Amortization of actuarial loss (1)
$3,929 $959 
Miscellaneous loss, net
Settlement (1)
3,349 6,446 
Miscellaneous loss, net
Total before income tax$7,278 $7,405 
Income tax— — Income tax benefit
Total, net of income tax$7,278 $7,405 
(1) These accumulated other comprehensive loss components are included in the computation of net periodic benefit costs for certain employee benefit plans. Refer to Note 20.
v3.20.4
Inventories, net (Tables)
 12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories, net consisted of the following: 
December 31,
 20202019
Raw coal$15,084 $26,584 
Saleable coal69,262 100,275 
Materials, supplies and other, net (1)
23,705 24,029 
Total inventories, net$108,051 $150,888 
(1) Includes an increase in allowance for obsolete material and supplies inventory of $807 recorded as restructuring expense during the year ended December 31, 2020 (refer to Note 8).
v3.20.4
Asset Impairment and Restructuring (Tables)
 12 Months Ended
Dec. 31, 2020
Restructuring and Related Activities [Abstract]  
Details of Long-Lived Asset Impairments
The following tables present the details of the long-lived asset impairments during the year ended December 31, 2020:

Year Ended December 31, 2020
First QuarterSecond QuarterThird QuarterFourth QuarterYear Ended
Continuing operations:
Met
$32,951 $— $— $13,366 $46,317 
CAPP - Thermal
758 17,385 219 16,270 34,632 
All Other— 5 — — 5 
Total from continuing operations$33,709 $17,390 $219 $29,636 $80,954 
Discontinued operations:$— $144,348 $3,297 $— $147,645 
Total long-lived asset impairment:$33,709 $161,738 $3,516 $29,636 $228,599 
Year Ended December 31, 2020
First QuarterSecond QuarterThird QuarterFourth QuarterYear Ended
Continuing operations:
Mineral rights, net
$21,825 $2,241 $— $17,513 $41,579 
Property, plant, and equipment, net
6,066 6,496 219 5,450 $18,231 
Acquired mine permits, net5,818 8,653 — 6,673 $21,144 
Total from continuing operations$33,709 $17,390 $219 $29,636 $80,954 
Discontinued operations:
Mineral rights, net
$— $16,364 $— $— $16,364 
Property, plant, and equipment, net
— 127,984 3,297 — $131,281 
Total from discontinued operations$— $144,348 $3,297 $— $147,645 
Total long-lived asset impairment:
Mineral rights, net
$21,825 $18,605 $— $17,513 $57,943 
Property, plant, and equipment, net
6,066 134,480 3,516 5,450 149,512 
Acquired mine permits, net5,818 8,653 — 6,673 21,144 
Total long-lived asset impairment$33,709 $161,738 $3,516 $29,636 $228,599 
Restructuring and Related Costs
As a result of the strategic actions discussed above, the Company recorded restructuring expense during the year ended December 31, 2020 as follows:
Year Ended December 31, 2020
Total Restructuring
Continuing Operations (3)
Discontinued Operations
Severance and employee-related benefits (1)
$26,037 $2,117 $23,920 
Other costs (2)
1,882 807 1,075 
Total restructuring expense$27,919 $2,924 $24,995 
(1) Severance and employee-related benefits were considered probable and estimable based on provisions of contractual agreements and existing employee benefit plans.
(2) The year ended December 31, 2020 includes accelerated amortization of deferred longwall move expenses of $668, allowance for advanced mining royalties of $407, and allowance for obsolete materials and supplies inventory of $807.
(3) During the year ended December 31, 2020, total restructuring expenses of $2,087 and $837 were recorded within the reportable segments CAPP - Thermal and All Other, respectively. The total restructuring expenses of $2,924 affected Accrued expenses and other current liabilities, Other non-current liabilities, inventories, net, and Other non-current assets.
v3.20.4
Prepaid Expenses and Other Current Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following:
December 31,
 20202019
Prepaid freight$8,515 $8,268 
Notes and other receivables13,245 8,447 
Short-term restricted cash9,311 12,363 
Short-term deposits47 689 
Prepaid insurance6,510 9,591 
Refundable income taxes64,565 33,915 
Prepaid bond premium2,576 2,454 
Other prepaid expenses1,483 1,996 
Total prepaid expenses and other current assets$106,252 $77,723 
Restricted investments consist of FDIC insured certificates of deposit, mutual funds, and U.S. treasury bills that are restricted as to withdrawal as required by certain agreements entered into by the Company and provide collateral to secure the following obligations which have been written on the Company’s behalf:

December 31, 2020December 31, 2019
Workers’ compensation obligations$51 $613 
Reclamation-related obligations22,233 18,786 
Financial payments and other performance obligations1,484 — 
Total restricted investments (1), (2)
$23,768 $19,399 
(1) Included within other non-current assets on the Company’s Consolidated Balance Sheets.
(2) As of December 31, 2020 and 2019, respectively, $22,498 and $11,021 are classified as trading securities and $1,270 and $8,378 are classified as held-to-maturity securities.

Deposits represent cash deposits held at third parties as required by certain agreements entered into by the Company to provide cash collateral to secure the following obligations which have been written on the Company’s behalf:
December 31, 2020December 31, 2019
Reclamation-related obligations$25,633 $8,887 
Financial payments and other performance obligations1,596 — 
Other operating agreements1,018 1,423 
Total deposits (1)
$28,247 $10,310 
(1) Included within prepaid expenses and other current assets and other non-current assets on the Company’s Consolidated Balance Sheets.
v3.20.4
Property, Plant, and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant, and Equipment, Net
Property, plant, and equipment, net, consisted of the following: 
December 31,
 20202019
Plant and mining equipment$603,463 $600,495 
Mine development96,008 36,721 
Land26,606 30,506 
Office equipment, software and other1,379 1,396 
Construction in progress18,587 23,658 
Total property, equipment and mine development costs746,043 692,776 
Less accumulated depreciation, depletion and amortization382,423 256,378 
Total property, plant, and equipment, net$363,620 $436,398 
v3.20.4
Other Non-Current Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Other Non-Current Assets
Other non-current assets consisted of the following:
December 31,
 20202019
Operating lease right-of-use assets$5,671 $7,298 
Long-term deposits28,200 9,621 
Long-term restricted investments23,768 19,399 
Equity method investments18,383 18,413 
Federal income tax receivable— 64,160 
Workers’ compensation receivables48,320 52,757 
Other25,040 17,827 
Total other non-current assets$149,382 $189,475 
v3.20.4
Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Right-of-use Assets and Lease Liabilities As of December 31, 2020 and 2019, the Company had the following right-of-use assets and lease liabilities within the Company’s Consolidated Balance Sheets:
December 31, 2020December 31, 2019
AssetsBalance Sheet Classification
Financing lease assetsProperty, plant, and equipment, net$4,262 $9,687 
Operating lease right-of-use assetsOther non-current assets5,671 7,298 
Total lease assets$9,933 $16,985 
LiabilitiesBalance Sheet Classification
Financing lease liabilities - currentCurrent portion of long-term debt$2,014 $3,266 
Operating lease liabilities - currentAccrued expenses and other current liabilities595 1,402 
Financing lease liabilities - long-termLong-term debt1,996 4,651 
Operating lease liabilities - long-termOther non-current liabilities5,076 5,896 
Total lease liabilities$9,681 $15,215 
Lease Costs and Other Information
Total lease costs and other lease information for the years ended December 31, 2020 and 2019 included the following:
Year Ended December 31, 2020Year Ended December 31, 2019
Lease cost (1)
Financing lease cost:
     Amortization of leased assets$3,238 $3,738 
     Interest on lease liabilities358 477 
Operating lease cost2,105 2,389 
Short-term lease cost1,518 1,851 
     Total lease cost$7,219 $8,455 
(1) The Company had no variable lease costs or sublease income for the years ended December 31, 2020 and 2019.

Year Ended December 31, 2020Year Ended December 31, 2019
Other information
Cash paid for amounts included in the measurement of lease liabilities$7,157 $8,349 
     Operating cash flows from financing leases$358 $463 
     Operating cash flows from operating leases$3,623 $4,240 
     Financing cash flows from financing leases$3,176 $3,646 
Right-of-use assets obtained in exchange for new financing lease liabilities$221 $1,429 
Right-of-use assets obtained in exchange for new operating lease liabilities$(12)$371 
Lease Term and Discount Rate
Weighted-average remaining lease term in months - financing leases23.333.7
Weighted-average remaining lease term in months - operating leases101.4105.1
Weighted-average discount rate - financing leases6.1 %5.4 %
Weighted-average discount rate - operating leases11.5 %11.4 %
Finance Lease Maturity The following table summarizes the maturity of the Company’s lease liabilities on an undiscounted cash flow basis and a reconciliation to the lease liabilities recognized in the Company’s Consolidated Balance Sheet as of December 31, 2020:
Financing LeasesOperating Leases
Lease cost
2021$2,210 $1,210 
20221,827 1,076 
2023269 1,101 
20246 982 
2025— 897 
Thereafter— 4,018 
Total future minimum lease payments$4,312 $9,284 
Imputed interest(302)(3,613)
Present value of future minimum lease payments$4,010 $5,671 
Operating Lease Maturity The following table summarizes the maturity of the Company’s lease liabilities on an undiscounted cash flow basis and a reconciliation to the lease liabilities recognized in the Company’s Consolidated Balance Sheet as of December 31, 2020:
Financing LeasesOperating Leases
Lease cost
2021$2,210 $1,210 
20221,827 1,076 
2023269 1,101 
20246 982 
2025— 897 
Thereafter— 4,018 
Total future minimum lease payments$4,312 $9,284 
Imputed interest(302)(3,613)
Present value of future minimum lease payments$4,010 $5,671 
v3.20.4
Accrued Expenses and Other Current Liabilities (Tables)
 12 Months Ended
Dec. 31, 2020
Payables and Accruals [Abstract]  
Schedule of Accrued Expenses and Other Current Liabilities
Accrued expenses and other current liabilities consisted of the following: 
December 31,
 20202019
Wages and benefits$40,330 $37,983 
Workers’ compensation 10,355 11,317 
Black lung 6,784 7,409 
Taxes other than income taxes21,540 24,662 
Current portion of asset retirement obligations24,990 38,731 
Accrued interest and fees15,902 4,362 
Deferred revenue13,197 — 
Freight accrual2,610 5,851 
Other 4,698 9,164 
Total accrued expenses and other current liabilities$140,406 $139,479 
v3.20.4
Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt consisted of the following: 
December 31,
 20202019
Term Loan Credit Facility - due June 2024$553,373 $558,991 
ABL Facility - due April 20223,350 — 
LCC Note Payable27,500 45,000 
LCC Water Treatment Obligation6,875 9,375 
Other (1)
8,475 9,263 
Debt discount and issuance costs(17,046)(29,695)
Total long-term debt 582,527 592,934 
Less current portion(28,830)(28,476)
Long-term debt, net of current portion$553,697 $564,458 
(1) Includes financing leases, refer to Note 12 for additional information.
Schedule of Maturities of Long-term Debt
Future maturities of long-term debt as of December 31, 2020 are as follows: 
2021$28,830 
202224,815 
20239,300 
2024536,628 
Total long-term debt$599,573 
v3.20.4
Acquisition-Related Obligations (Tables)
 12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of Acquisition-Related Obligations Acquisition-related obligations consisted of the following:
December 31,
20202019
Contingent Revenue Obligation$28,967 $52,427 
Environmental Settlement Obligations10,391 16,305 
Reclamation Funding Liability— 12,000 
UMWA Funds Settlement Liability2,000 4,000 
Discount(1,491)(4,834)
Total acquisition-related obligations 39,867 79,898 
Less current portion(19,099)(33,639)
Acquisition-related obligations, net of current portion$20,768 $46,259 
v3.20.4
Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Summary of Changes in Asset Retirement Obligations
The following table summarizes the changes in asset retirement obligations for the years ended December 31, 2020 and 2019:
Total asset retirement obligations at December 31, 2018$192,038 
Merger measurement-period adjustments12,718 
Accretion for the period (1)
23,852 
Sites added during the period5,112 
Revisions in estimated cash flows (2)
(7,162)
Expenditures for the period(23,421)
Total asset retirement obligations at December 31, 2019$203,137 
Accretion for the period26,504 
Sites added during the period 621 
Revisions in estimated cash flows (2)
(43,765)
Expenditures for the period(21,433)
Total asset retirement obligations at December 31, 2020165,064 
Less current portion (3)
(24,990)
Long-term portion$140,074 
(1)    Amount does not include the accretion related to asset retirement obligations classified as liabilities held for sale.
(2)    The revisions in estimated cash flows resulted primarily from discount rate adjustments and changes in mine plans.
(3)    Included within accrued expenses and other current liabilities on the Company’s Consolidated Balance Sheets. Refer to Note 14.
v3.20.4
Fair Value of Financial Instruments and Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Nonrecurring
The following tables set forth by level, within the fair value hierarchy, the Company’s long-term debt at fair value as of December 31, 2020 and 2019:
December 31, 2020
Carrying
     Amount (1)
Total Fair
Value		Quoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Term Loan Credit Facility - due June 2024$540,643 $379,614 $— $379,614 $— 
ABL Facility - due April 20223,350 3,057 — — 3,057 
LCC Note Payable24,423 20,328 — — 20,328 
LCC Water Treatment Obligation5,636 4,281 — — 4,281 
Total long-term debt$574,052 $407,280 $— $379,614 $27,666 
December 31, 2019
Carrying
Amount (1)
Total Fair
Value		Quoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Term Loan Credit Facility - due June 2024$538,765 $461,402 $461,402 $— $— 
LCC Note Payable37,695 33,884 — — 33,884 
LCC Water Treatment Obligation7,211 6,280 — — 6,280 
Total long-term debt$583,671 $501,566 $461,402 $— $40,164 
(1) Net of debt discounts and debt issuance costs.

The following tables set forth by level, within the fair value hierarchy, the Company’s acquisition-related obligations at fair value as of December 31, 2020 and 2019:
 December 31, 2020
Carrying
Amount (1)
Total Fair ValueQuoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
UMWA Funds Settlement Liability$1,662 $1,426 $— $— $1,426 
Environmental Settlement Obligations9,237 7,760 — — 7,760 
Total acquisition-related obligations$10,899 $9,186 $— $— $9,186 

 December 31, 2019
Carrying
Amount (1)
Total Fair ValueQuoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
UMWA Funds Settlement Liability$3,069 $2,929 $— $— $2,929 
Reclamation Funding Liability10,808 10,658 — — 10,658 
Environmental Settlement Obligations13,594 12,197 — — 12,197 
Total acquisition-related obligations$27,471 $25,784 $— $— $25,784 
(1) Net of discounts.
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following table sets forth by level, within the fair value hierarchy, the Company’s financial and non-financial assets and liabilities that were accounted for at fair value on a recurring basis as of December 31, 2020 and 2019. Financial and non-financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the determination of fair value for assets and liabilities and their placement within the fair value hierarchy levels.
 December 31, 2020
Total Fair ValueQuoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Contingent Revenue Obligation$28,967 $— $— $28,967 
Trading securities$22,498 $20,092 $2,406 $— 
 December 31, 2019
Total Fair ValueQuoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Contingent Revenue Obligation$52,427 $— $— $52,427 
Trading securities$11,021 $5,506 $5,515 $— 

The following table is a reconciliation of the financial and non-financial assets and liabilities that were accounted for at fair value on a recurring basis and that were categorized within Level 3 of the fair value hierarchy:
December 31, 2019PaymentsGain Recognized in EarningsTransfer In (Out) of Level 3 Fair Value HierarchyDecember 31, 2020
Contingent Revenue Obligation $52,427 $(14,710)$(8,750)$— $28,967 
(1) The gain recognized in earnings resulted primarily from a change in the forecasted future revenue associated with this obligation and an increase in annualized volatility as of December 31, 2020.
December 31, 2018PaymentsMeasurement-Period AdjustmentsGain Recognized in EarningsTransfer In (Out) of Level 3 Fair Value HierarchyDecember 31, 2019
Contingent Revenue Obligation$59,880 $(9,627)$5,738 $(3,564)$— $52,427 
The range of significant unobservable inputs used to value the contingent revenue obligation as of December 31, 2020 and December 31, 2019, are set forth in the following table:
 December 31, 2020December 31, 2019
Forecasted future revenue
$0.9 - $1.1 billion
$1.1 - $1.2 billion
Stated royalty rate
1.0% - 1.5%
1.0% - 1.5%
Annualized volatility
19.4% - 52.1% (28.0%)
9.4% - 28.1% (19.9%)
v3.20.4
Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Schedule of Allocation of Income Tax Expense (Benefit)
Total income tax benefit provided on loss before income taxes was allocated as follows:
Year Ended December 31,
20202019
Continuing operations$(2,164)$(53,287)
Discontinued operations— (8,484)
Total$(2,164)$(61,771)
Schedule of Components of Income Tax Expense (Benefit)
Significant components of income tax (benefit) expense from continuing operations were as follows:
Year Ended December 31,
20202019
Current tax (benefit) expense:
Federal$(35,187)$(45,356)
State(99)1,891 
Total current$(35,286)$(43,465)
Deferred tax (benefit) expense:
Federal$33,348 $(747)
State(226)(9,075)
Total deferred $33,122 $(9,822)
Total income tax benefit:
Federal$(1,839)$(46,103)
State(325)(7,184)
Total$(2,164)$(53,287)
Schedule of Effective Income Tax Rate Reconciliation A reconciliation of statutory federal income tax benefit on loss from continuing operations to the actual income tax benefit is as follows:
Year Ended December 31,
20202019
Federal statutory income tax benefit$(51,163)$(57,310)
Increase (reductions) in taxes due to:
Percentage depletion allowance(2,039)(6,270)
AMT sequestration refund(2,123)— 
State taxes, net of federal tax impact(9,640)(10,255)
State tax rate and NOL change, net of federal tax impact(1,235)(4,172)
Change in valuation allowances59,929 10,936 
Net operating loss carryback— (14,234)
Amended return - capital loss impact— 919 
Non-deductible goodwill impairment— 26,114 
Stock-based compensation1,739 (1,085)
Other, net 2,368 2,070 
Income tax benefit$(2,164)$(53,287)
Schedule of Deferred Tax Assets and Liabilities The net deferred tax assets and liabilities included in the Consolidated Balance Sheets include the following amounts:
Year Ended December 31,
20202019
Deferred tax assets:
  Asset retirement obligations$41,268 $51,114 
  Reserves and accruals not currently deductible12,131 8,265 
  Workers’ compensation benefit obligations59,478 54,128 
Pension obligations52,598 44,413 
  Equity method investments2,050 2,509 
Alternative minimum tax credit carryforwards— 33,065 
Loss carryforwards, net of Section 382 limitation255,772 142,510 
  Acquisition-related obligations10,002 17,902 
  Other 10,976 12,299 
     Gross deferred tax assets444,275 366,205 
Less valuation allowance(263,387)(133,020)
     Deferred tax assets$180,888 $233,185 
Deferred tax liabilities:
Property, plant and mineral reserves$(141,549)$(145,487)
  Acquired intangibles, net(22,037)(27,140)
  Prepaid expenses(6,211)(6,780)
Restricted cash(11,516)(20,313)
  Other (55)(822)
     Total deferred tax liabilities(181,368)(200,542)
     Net deferred tax assets$(480)$32,643 
Summary of Valuation Allowance Changes in the valuation allowance were as follows:
Year Ended December 31,
20202019
Valuation allowance beginning of period$133,020 $94,802 
Increase in valuation allowance recorded to income tax benefit117,829 29,950 
Increase in valuation allowance not affecting income tax expense12,538 8,268 
Valuation allowance end of period$263,387 $133,020 
Schedule of Liability for Uncertain Tax Positions
The following reconciliation illustrates the Company’s liability for uncertain tax positions:
Year Ended December 31,
20202019
Unrecognized tax benefits - beginning of period$20,788 $— 
Additions for tax positions of prior years— 5,740 
Additions for tax positions of current year— 15,048 
Reductions for tax positions of prior years(20,788)— 
Unrecognized tax benefits - end of period$— $20,788 
v3.20.4
Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Compensation Related Costs [Abstract]  
Changes in Accumulated Benefits Obligations, Fair Value of Plan Assets and Funded Status of Plan The following tables set forth the plans’ accumulated benefit obligations, fair value of plan assets and funded status for the years ended December 31, 2020 and 2019.
Year Ended December 31,
20202019
Change in benefit obligations:
Accumulated benefit obligation at beginning of period:$674,439 $675,482 
Interest cost18,730 26,564 
Actuarial loss (1)
72,822 91,287 
Benefits paid(30,916)(31,371)
Acquisition— 1,910 
Settlement(11,627)(89,433)
Accumulated benefit obligation at end of period$723,448 $674,439 
Change in fair value of plan assets:
Fair value of plan assets at beginning of period$470,353 $494,680 
Actual return on plan assets54,222 87,129 
Employer contributions22,745 9,348 
Benefits paid(30,916)(31,371)
Settlement(11,627)(89,433)
Fair value of plan assets at end of period$504,777 $470,353 
Funded status$(218,671)$(204,086)
Accrued benefit cost at end of period (2)
$(218,671)$(204,086)
(1) For the years ended December 31, 2020 and December 31, 2019, the actuarial loss was primarily attributed to the decrease in the weighted-average discount rate actuarial assumption used in determining the benefit obligations.
The following tables set forth the accumulated black lung benefit obligations, fair value of plan assets and funded status for the years ended December 31, 2020 and 2019:
Year Ended December 31,
20202019
Change in benefit obligation:
Accumulated benefit obligation at beginning of period$122,788 $94,805 
Service cost2,361 2,057 
Interest cost3,240 4,474 
Actuarial loss (1)
14,736 11,166 
Benefits paid(7,166)(6,543)
Acquisition— 16,829 
Curtailment gain(163)— 
Settlement(8,290)— 
Accumulated benefit obligation at end of period$127,506 $122,788 
Change in fair value of plan assets:
Fair value of plan assets at beginning of period$2,660 $2,597 
Actual return on plan assets60 63 
Benefits paid(7,166)(6,543)
Employer contributions7,166 6,543 
Fair value of plan assets at end of period (2)
2,720 2,660 
Funded status$(124,786)$(120,128)
Accrued benefit cost at end of period$(124,786)$(120,128)
Summary of accrued benefit cost at end of period:
Continuing operations(122,961)(111,036)
Discontinued operations (3)
(1,825)(9,092)
Total accrued benefit cost at end of period$(124,786)$(120,128)
(1) For the years ended December 31, 2020 and December 31, 2019, the actuarial loss was primarily attributed to the decrease in the weighted-average discount rate actuarial assumption used in determining the benefit obligations and the annual updates to demographic information.
(2) Assets of the plan are held in a Section 501(c)(21) tax-exempt trust fund and consist primarily of government debt securities. All assets are classified as Level 1 and valued based on quoted market prices.
(3) The discontinued operations consisted of activity related to the Company’s former NAPP operations. Refer to Note 3The following tables set forth the accumulated postretirement life insurance benefit obligations, fair value of plan assets and funded status for the years ended December 31, 2020 and 2019:
December 31,
20202019
Change in benefit obligation:
Accumulated benefit obligation at beginning of period$12,341 $11,368 
Interest cost337 426 
Actuarial loss420 1,002 
Benefits paid(463)(455)
Accumulated benefit obligation at end of period$12,635 $12,341 
Change in fair value of plan assets:
Benefits paid (1)
(463)(455)
Employer contributions (1)
463 455 
Fair value of plan assets at end of period$— $— 
Funded status(12,635)(12,341)
Accrued benefit cost at end of year$(12,635)$(12,341)
Amounts recognized in the consolidated balance sheets:
Current liabilities$628 $719 
Long-term liabilities12,007 11,622 
$12,635 $12,341 
(1) Amount is comprised of premium payments to commercial life insurance provider.
Schedule of Amounts Recognized in Accumulated Other Comprehensive (Income) Loss
Gross amounts related to pension obligations recognized in accumulated other comprehensive loss consisted of the following as of December 31, 2020 and 2019:
December 31,
20202019
Net actuarial loss$88,583 $46,568 
Gross amounts related to the black lung obligations recognized in accumulated other comprehensive loss consisted of the following as of December 31, 2020 and 2019: 
December 31,
20202019
Net actuarial loss $24,042 $12,980 
Gross amounts related to the postretirement life insurance benefit obligations recognized in accumulated other comprehensive income consisted of the following as of December 31, 2020 and 2019: 
December 31,
20202019
Net actuarial gain$(390)$(872)
Schedule of Net Periodic Benefit Cost
The following table details the components of net periodic benefit (credit) cost:
Year Ended December 31,
20202019
Interest cost$18,730 $26,564 
Expected return on plan assets(27,064)(28,042)
Amortization of net losses2,012 797 
Settlement1,636 6,224 
Net periodic benefit (credit) cost$(4,686)$5,543 
The following table details the components of the net periodic benefit cost for black lung obligations:
Year Ended December 31,
20202019
Service cost$2,361 $2,057 
Interest cost3,240 4,474 
Expected return on plan assets(54)(65)
Amortization of net actuarial loss 1,942 216 
Settlement1,563 — 
Net periodic benefit cost$9,052 $6,682 
Summary net periodic benefit cost:
Continuing operations$7,670 $6,394 
Discontinued operations (1)
1,382 288 
Total net periodic benefit cost$9,052 $6,682 
The following table details the components of the net periodic benefit cost for postretirement life insurance benefit obligations:
December 31,
20202019
Interest cost$337 $426 
Amortization of net actuarial gain(48)(105)
Settlement(14)— 
Net periodic benefit cost$275 $321 
Schedule of Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive (Income) Loss
Other changes in plan assets and benefit obligations recognized in other comprehensive loss are as follows:
Year Ended December 31,
20202019
Actuarial loss (1)
$45,663 $30,514 
Amortization of net actuarial loss(2,012)(797)
Settlement(1,636)(6,224)
Total recognized in other comprehensive loss$42,015 $23,493 
Other changes in the black lung plan assets and benefit obligations recognized in other comprehensive loss are as follows:
Year Ended December 31,
20202019
Actuarial loss (1)
$14,567 $11,512 
Amortization of net actuarial loss(1,942)(216)
Settlement(1,563)— 
Total recognized in other comprehensive loss $11,062 $11,296 
(1) For the years ended December 31, 2020 and December 31, 2019, the actuarial loss was primarily attributed to the decrease in the weighted-average discount rate actuarial assumption used in determining the benefit obligations and the annual updates to demographic information.
Other changes in the postretirement life insurance plan assets and benefit obligations recognized in other comprehensive income are as follows:
December 31,
20202019
Actuarial loss$420 $1,002 
Amortization of net actuarial gain48 105 
Settlement14 — 
Total recognized in other comprehensive income $482 $1,107 
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets
The following table presents information applicable to plans with accumulated benefit obligations in excess of plan assets:
Year Ended December 31,
20202019
Projected benefit obligation$723,448 $674,439 
Accumulated benefit obligation$723,448 $674,439 
Fair value of plan assets$504,777 $470,353 
Schedule of Assumptions Used
The weighted-average actuarial assumption used in determining the benefit obligations as of December 31, 2020 and 2019 was as follows: 
December 31,
20202019
Discount rate2.62 %3.36 %

The weighted-average actuarial assumptions used to determine net periodic benefit cost for the years ended December 31, 2020 and 2019 were as follows: 
Year Ended December 31,
20202019
Discount rate for benefit obligation3.35 %4.33 %
Discount rate for interest cost2.92 %4.01 %
Expected return on plan assets5.90 %5.80 %
The weighted-average assumptions related to black lung obligations used to determine the benefit obligation as of December 31, 2020 and 2019 were as follows: 
December 31,
20202019
Discount rate2.75 %3.47 %
Federal black lung benefit trend rate2.00 %2.00 %
Black lung medical benefit trend rate5.00 %5.00 %
Black lung benefit expense inflation rate2.00 %2.00 %

The weighted-average assumptions related to black lung obligations used to determine net periodic benefit cost were as follows:
Year Ended December 31,
20202019
Discount rate for benefit obligation3.47 %4.36 %
Discount rate for service cost3.56 %4.54 %
Discount rate for interest cost2.61 %3.99 %
Federal black lung benefit trend rate2.50 %2.50 %
Black lung medical benefit trend rate5.00 %5.00 %
Black lung benefit expense inflation rate2.00 %2.50 %
Expected return on plan assets2.00 %2.50 %
The weighted-average assumptions related to postretirement life insurance benefit obligations used to determine the benefit obligation as of December 31, 2020 and 2019 was as follows: 
December 31,
20202019
Discount rate2.43 %3.22 %

The weighted-average assumptions related to postretirement life insurance benefit obligations used to determine net periodic benefit cost were as follows:
Year Ended December 31,
20202019
Discount rate for benefit obligations3.22 %4.21 %
Discount rate for interest cost2.83 %3.9 %
Schedule of Allocation of Plan Assets The target allocation for 2021 and the actual asset allocation as reported at December 31, 2020 are as follows:
Target Allocation Percentages 2021Percentage of Plan Assets 2020
Equity securities60.0 %47.0 %
Fixed income funds40.0 %50.0 %
Other— %3.0 %
Total100.0 %100.0 %
Schedule of Estimated Cash Payments
The following represents expected future pension benefit payments for the next ten years:
2021$31,178 
202231,267 
202331,628 
202432,149 
202532,426 
2026-2030162,622 
$321,270 
Estimated future cash payments related to black lung obligations for the next 10 years ending after December 31, 2020 are as follows: 
Year ending December 31:
2021$6,810 
20226,929 
20237,038 
20247,112 
20257,244 
2026-203020,004 
$55,137 
Estimated future cash payments related to postretirement life insurance benefit obligations for the next 10 years ending after December 31, 2020 are as follows: 
Year ending December 31:
2021$628 
2022588 
2023586 
2024586 
2025587 
2026-20302,941 
$5,916 
Schedule of Changes in Fair Value of Plan Assets
The fair values of the Company’s Pension Plans’ assets as of December 31, 2020, by asset category are as follows:
Asset CategoryTotalQuoted Market Prices in Active Market for Identical Assets (Level 1)Significant Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Equity securities:
Multi-asset fund (1)
$236,405 $— $236,405 $— 
Fixed income funds:
Bond fund (2)
253,218 — 253,218 — 
Commingled short-term fund (3)
1,405 — 1,405 — 
Other types of investments:
Guaranteed insurance contract11,454 — — 11,454 
Total$502,482 $— $491,028 $11,454 
Receivable (4)
888 
Total assets at fair value503,370 
Private equity funds measured at net asset value practical expedient (5)
1,407 
Total plan assets$504,777 
(1) This fund contains equities (domestic and international), real estate and bonds.
(2) This fund contains bonds representing a diversity of sectors and maturities. This fund also includes mortgage-backed securities and U.S. Treasuries.
(3) This fund contains cash and highly liquid short-term investments in a collective investment fund.
(4) Receivable for investments sold at December 31, 2020, which approximates fair value.
(5) In accordance with Accounting Standards Update 2015-07, investments that are measured at fair value using the net asset value per share practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the total value of assets of the plans.

Changes in Level 3 plan assets for the period ended December 31, 2020 were as follows:
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Guaranteed Insurance Contract
Beginning balance, December 31, 2019$11,155 
Actual return on plan assets:
Relating to assets still held at the reporting date659 
Purchases, sales and settlements(360)
Ending balance, December 31, 2020$11,454 

The fair values of the Company’s Pension Plans’ assets as of December 31, 2019, by asset category are as follows:
Asset CategoryTotalQuoted Market Prices in Active Market for Identical Assets (Level 1)Significant Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Equity securities:
Multi-asset fund (1)
$182,782 $— $182,782 $— 
Fixed income funds:
Bond fund (2)
272,239 — 272,239 — 
Commingled short-term fund (3)
1,572 — 1,572 — 
Other types of investments:
Guaranteed insurance contract11,155 — — 11,155 
Total$467,748 $— $456,593 $11,155 
Receivable (4)
1,061 
Total assets at fair value468,809 
Private equity funds measured at net asset value practical expedient (5)
1,544 
Total plan assets$470,353 
(1) This fund contains equities (domestic and international), real estate and bonds.
(2) This fund contains bonds representing a diversity of sectors and maturities. This fund also includes mortgage-backed securities and U.S. Treasuries.
(3) This fund contains cash and highly liquid short-term investments in a collective investment fund.
(4) Receivable for investments sold at December 31, 2019, which approximates fair value.
(5) In accordance with Accounting Standards Update 2015-07, investments that are measured at fair value using the net asset value per share practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the total value of assets of the plans.

Changes in Level 3 plan assets for the period ended December 31, 2019 were as follows:
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Guaranteed Insurance Contract
Beginning balance, December 31, 2018$10,886 
Acquisition— 
Actual return on plan assets:
Relating to assets still held at the reporting date644 
Purchases, sales and settlements(375)
Ending balance, December 31, 2019$11,155 
Schedule of Amounts Recognized in Balance Sheet The table below presents amounts recognized in the Balance Sheets:
December 31,
20202019
Current liabilities$6,784 $7,409 
Current liabilities - discontinued operations26 63 
Long-term liabilities116,177 103,627 
Long-term liabilities - discontinued operations1,799 9,029 
$124,786 $120,128 
v3.20.4
Stock-Based Compensation Awards (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Valuation Assumptions The Monte Carlo simulation incorporated the assumptions as presented in the following table:
Relative performance-based restricted stock units
Start price (1)
$7.59 
Valuation date stock price (2)
$6.33 
Expected volatility (3)
55.27 %
Risk-free interest rate (4)
1.37 %
Expected dividend yield (5)
— %
(1)    The start price for the Company represented the average closing stock price over the twenty trading days ending on December 31, 2019, assuming dividends distributed during this period were reinvested in additional shares of the Company’s stock on the ex-dividend date.
(2)    The valuation date stock price represented the closing price on the grant date.
(3)    The expected volatility assumption was based on the historical volatility of the price of the Company’s stock.
(4)    The annual risk-free interest rate equaled the yield on the semi-annual zero coupon U.S. Treasury rates converted to continuously compounded rates that had a term equal to the length of the remaining performance measurement period as of the valuation date.
(5)    The expected dividend yield represented the investments return to a share of the Company’s stock that is not available to the holder of the performance-based restricted stock unit.
The Monte Carlo simulation incorporates the assumptions as presented in the following table:
Performance-based cash incentive awards
Start price (1)
$7.59 
Valuation date stock price (2)
$6.33 
Expected volatility (3)
55.27 %
Risk-free interest rate (4)
1.37 %
Expected dividend yield (5)
— %
(1)    The start price for the Company represents the average closing stock price over the twenty trading days ending on December 31, 2019, assuming dividends distributed during this period were reinvested in additional shares of the Company’s stock on the ex-dividend date.
(2)    The valuation date stock price represents the closing price at each reporting date.
(3)    The expected volatility assumption is based on the historical volatility of the price of the Company’s stock.
(4)    The annual risk-free interest rate equals the yield on the semi-annual zero coupon U.S. Treasury rates converted to continuously compounded rates that have a term equal to the length of the remaining performance measurement period as of the valuation date.
(5)    The expected dividend yield represents the investments return to a share of the Company’s stock that is not available to the holder of the performance-based restricted stock unit.
The Monte Carlo simulations incorporate the assumptions as presented in the following tables:
Relative performance-based restricted stock units
Start price (1)
$66.06 
Dividend adjusted stock price (2)
$61.27 
Expected volatility (3)
29.98 %
Risk-free interest rate (4)
2.42 %
Expected dividend yield (5)
— %
(1)    The start price for the Company represents the average closing stock price over the ten trading days ending on December 31, 2018, assuming dividends distributed during this period were reinvested in additional shares of the Company’s stock on the ex-dividend date.
(2)    The dividend adjusted stock price represents the closing price on the grant date assuming dividends distributed during the period since December 17, 2018, were reinvested in additional shares of the Company’s stock on the ex-dividend date.
(3)    The expected volatility assumption is based on the historical volatility of the price of the Company’s stock.
(4)    The annual risk-free interest rate equals the yield on zero coupon U.S. Treasury Separate Trading of Registered Interest and Principal of Securities (“STRIPS”) that have a term equal to the length of the remaining performance measurement period as of the valuation date.
(5)    The expected dividend yield represents the investments return to a share of the Company’s stock that is not available to the holder of an absolute performance-based restricted stock unit.
Absolute performance-based restricted stock units
Valuation date stock price$61.27 
Expected volatility (1)
29.98 %
Risk-free interest rate (2)
2.42 %
Expected dividend yield (3)
— %
(1)    The expected volatility assumption is based on the historical volatility of the price of the Company’s stock.
(2)    The annual risk-free interest rate equals the yield on zero coupon U.S. Treasury STRIPS that have a term equal to the length of the remaining performance measurement period as of the valuation date.
(3)    The expected dividend yield represents the investments return to a share of the Company’s stock that is not available to the holder of an absolute performance-based restricted stock unit.
Schedule of Restricted Stock Shares and Restricted Share Units Activity
Restricted stock activity for the year ended December 31, 2020 is summarized in the following table: 
Restricted stock activity:Number of  SharesWeighted-Average Grant  Date Fair Value
Non-vested shares outstanding at December 31, 201923,598 $65.55 
Granted— $— 
Vested(23,598)$65.55 
Forfeited or Expired— $— 
Non-vested shares outstanding at December 31, 2020— $— 
Time-based restricted stock unit activity for the year ended December 31, 2020 is summarized in the following table: 
Time-based restricted stock unit activity:Number of  SharesWeighted-Average Grant  Date Fair Value
Non-vested shares outstanding at December 31, 2019158,082 $64.84 
Granted402,620 $6.17 
Vested (1)
(149,829)$45.22 
Forfeited or Cancelled(43,320)$21.10 
Non-vested shares outstanding at December 31, 2020367,553 $13.72 
(1) Includes 33,508 shares with deferred settlement pursuant to the award agreement.
Schedule of Performance Shares Activity
Relative performance-based restricted stock unit activity for the year ended December 31, 2020 is summarized in the following table: 
Relative performance-based restricted stock unit activity:Number of  SharesWeighted-Average Grant  Date Fair Value
Non-vested shares outstanding at December 31, 201931,599 $65.70 
Granted151,397 $8.53 
Vested (1)
(3,864)$65.70 
Forfeited(4,929)$65.70 
Non-vested shares outstanding at December 31, 2020174,203 $16.01 
(1) Includes 3,042 of vested shares due to the employment criteria being satisfied during the period. Until the performance criteria is satisfied, these shares will remain unsettled.
Absolute performance-based restricted stock unit activity for the year ended December 31, 2020 is summarized in the following table: 
Absolute performance-based restricted stock unit activity:Number of SharesWeighted-Average Grant  Date Fair Value
Non-vested shares outstanding at December 31, 201910,549 $50.60 
Granted— $— 
Vested (1)
(1,290)$50.60 
Forfeited(1,645)$50.60 
Non-vested shares outstanding at December 31, 20207,614 $50.60 
(1) Includes 1,016 of vested shares due to the employment criteria being satisfied during the period. Until the performance criteria is satisfied, these shares will remain unsettled.
Operational performance-based restricted stock unit activity for the year ended December 31, 2020 is summarized in the following table: 
Operational performance-based restricted stock unit activity:
Number of  SharesWeighted-Average Fair Value
Non-vested shares outstanding at December 31, 2019— $— 
Granted151,398 $6.36 
Vested— $— 
Forfeited— $— 
Non-vested shares outstanding at December 31, 2020151,398 $6.36 
Performance-based cash incentive award activity for the year ended December 31, 2020 is summarized in the following table: 
Performance-based cash incentive award activity:Target Dollar ValueWeighted-Average Fair Value as a % of Target Dollar Value
Non-vested awards outstanding at December 31, 2019$— — %
Granted2,755 82.45 %
Vested (1)
(42)100.00 %
Forfeited(507)70.70 %
Non-vested awards outstanding at December 31, 2020$2,206 94.21 %
(1) Vested awards were paid at target dollar value due to the employment criteria being satisfied during the period.
Schedule of Stock Option Activity
30-day VWAP stock option activity for the year ended December 31, 2020 is summarized in the following table:
Number of SharesWeighted-Average Exercise Price Per ShareWeighted-Average Remaining Contractual Term (Years)
Aggregate Intrinsic Value (1)
Outstanding at December 31, 201951,359 $63.45 7.15$(2,794)
Exercisable at December 31, 201944,356 $63.03 7.15$(2,394)
Granted— $— 
Exercised— $— $— 
Forfeited or Expired(28,134)$66.13 
Outstanding at December 31, 202023,225 $60.20 6.12$(1,134)
Exercisable at December 31, 202023,225 $60.20 6.12$(1,134)
(1) The aggregate intrinsic value of outstanding and exercisable options is calculated as the difference between the exercise price and the Company’s stock price at each reporting period end. The aggregate intrinsic value of exercised options is calculated as the difference between the exercise price and the Company’s stock price on the exercise date. During the year ended December 31, 2019, the aggregate intrinsic value of options exercised was $6,305.
v3.20.4
Commitment and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Restrictions on Cash and Cash Equivalents
Amounts included in restricted cash represent cash deposits primarily invested in interest bearing accounts that are restricted as to withdrawal as required by certain agreements entered into by the Company and provide collateral to secure the following obligations which have been written on the Company’s behalf:

December 31, 2020December 31, 2019
Workers’ compensation and black lung obligations$69,725 $51,650 
Reclamation-related obligations8,445 67,868 
Financial payments and other performance obligations17,863 3,006 
Contingent revenue obligation escrow9,311 12,363 
Total restricted cash105,344 134,887 
Less current portion (1)
(9,311)(12,363)
Restricted cash, net of current portion$96,033 $122,524 
(1) Included within prepaid expenses and other current assets on the Company’s Consolidated Balance Sheets.
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following:
December 31,
 20202019
Prepaid freight$8,515 $8,268 
Notes and other receivables13,245 8,447 
Short-term restricted cash9,311 12,363 
Short-term deposits47 689 
Prepaid insurance6,510 9,591 
Refundable income taxes64,565 33,915 
Prepaid bond premium2,576 2,454 
Other prepaid expenses1,483 1,996 
Total prepaid expenses and other current assets$106,252 $77,723 
Restricted investments consist of FDIC insured certificates of deposit, mutual funds, and U.S. treasury bills that are restricted as to withdrawal as required by certain agreements entered into by the Company and provide collateral to secure the following obligations which have been written on the Company’s behalf:

December 31, 2020December 31, 2019
Workers’ compensation obligations$51 $613 
Reclamation-related obligations22,233 18,786 
Financial payments and other performance obligations1,484 — 
Total restricted investments (1), (2)
$23,768 $19,399 
(1) Included within other non-current assets on the Company’s Consolidated Balance Sheets.
(2) As of December 31, 2020 and 2019, respectively, $22,498 and $11,021 are classified as trading securities and $1,270 and $8,378 are classified as held-to-maturity securities.

Deposits represent cash deposits held at third parties as required by certain agreements entered into by the Company to provide cash collateral to secure the following obligations which have been written on the Company’s behalf:
December 31, 2020December 31, 2019
Reclamation-related obligations$25,633 $8,887 
Financial payments and other performance obligations1,596 — 
Other operating agreements1,018 1,423 
Total deposits (1)
$28,247 $10,310 
(1) Included within prepaid expenses and other current assets and other non-current assets on the Company’s Consolidated Balance Sheets.
v3.20.4
Concentration of Credit Risk and Major Customers (Tables)
 12 Months Ended
Dec. 31, 2020
Risks and Uncertainties [Abstract]  
Schedule of Concentration of Credit Risk and Major Customers The following table presents additional information on our total revenues and top customers:
Year Ended December 31,
 20202019
Total revenue$1,416,187 $2,001,280 
Top customer as % of total revenue 16 %13 %
Top 10 customers as % of total revenue 63 %59 %
Number of customers exceeding 10% of total revenue2 2 
Number of customers exceeding 10% of total trade accounts receivable, net3 3 
Domestic revenue as % of coal revenue 36 %39 %
Export revenue as % of coal revenue 64 %61 %
Countries with export revenue exceeding 10% of total revenue India, BrazilIndia
Met coal as % of coal sales volume80 %74 %
Thermal coal as % of coal sales volume20 %26 %
v3.20.4
Segment Information (Tables)
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Schedule of Segment Operating Results and Capital Expenditures
Segment operating results and capital expenditures from continuing operations for the year ended December 31, 2020 were as follows: 
Year Ended December 31, 2020
MetCAPP - ThermalAll OtherConsolidated
Total revenues$1,264,496 $149,037 $2,654 $1,416,187 
Depreciation, depletion, and amortization$124,060 $20,453 $(4,628)$139,885 
Amortization of acquired intangibles, net$12,889 $(3,775)$100 $9,214 
Adjusted EBITDA$120,281 $9,853 $(46,732)$83,402 
Capital expenditures$111,745 $7,106 $728 $119,579 
Segment operating results and capital expenditures from continuing operations for the year ended December 31, 2019 were as follows: 
Year Ended December 31, 2019
MetCAPP - ThermalAll OtherConsolidated
Total revenues$1,711,260 $286,486 $3,534 $2,001,280 
Depreciation, depletion, and amortization$152,835 $57,483 $5,439 $215,757 
Amortization of acquired intangibles, net$10,389 $(13,578)$— $(3,189)
Adjusted EBITDA$316,006 $11,981 $(63,883)$264,104 
Capital expenditures$140,250 $17,545 $2,652 $160,447 
Reconciliation of Net Income (Loss) to Adjusted EBITDA
The following table presents a reconciliation of net loss from continuing operations to Adjusted EBITDA for the year ended December 31, 2020:
Year Ended December 31, 2020
MetCAPP - ThermalAll OtherConsolidated
Net loss from continuing operations$(77,519)$(52,520)$(111,431)$(241,470)
Interest expense(2,014)6 76,536 74,528 
Interest income(63)— (6,964)(7,027)
Income tax benefit— — (2,164)(2,164)
Depreciation, depletion and amortization124,060 20,453 (4,628)139,885 
Non-cash stock compensation expense289 8 4,600 4,897 
Mark-to-market adjustment - acquisition-related obligations— — (8,750)(8,750)
Accretion on asset retirement obligations14,214 9,285 3,005 26,504 
Asset impairment and restructuring (1)
46,317 36,719 842 83,878 
Management restructuring costs (2)
501 5 435 941 
Loss on partial settlement of benefit obligations1,607 (328)1,687 2,966 
Amortization of acquired intangibles, net12,889 (3,775)100 9,214 
Adjusted EBITDA $120,281 $9,853 $(46,732)$83,402 
(1) Asset impairment and restructuring for the year ended December 31, 2020 includes long-lived asset impairments of $80,954 and restructuring expense of $2,924. Refer to Note 8 for further information.
(2) Management restructuring costs are related to severance expense associated with senior management changes during the three months ended March 31, 2020.
The following table presents a reconciliation of net income (loss) from continuing operations to Adjusted EBITDA for the year ended December 31, 2019:
Year Ended December 31, 2019
MetCAPP - ThermalAll OtherConsolidated
Net income (loss) from continuing operations$7,944 $(97,398)$(130,164)$(219,618)
Interest expense(1,209)23 68,707 67,521 
Interest income(100)— (7,147)(7,247)
Income tax benefit— — (53,287)(53,287)
Depreciation, depletion and amortization152,835 57,483 5,439 215,757 
Merger-related costs— — 1,090 1,090 
Non-cash stock compensation expense1,494 71 10,783 12,348 
Mark-to-market adjustment - acquisition-related obligations— — (3,564)(3,564)
Accretion on asset retirement obligations9,599 10,929 3,337 23,865 
Loss on modification and extinguishment of debt— — 26,459 26,459 
Asset impairment (1)
15,034 50,993 297 66,324 
Goodwill impairment (2)
124,353 — — 124,353 
Cost impact of coal inventory fair value adjustment (3)
4,751 3,458 — 8,209 
Gain on assets acquired in an exchange transaction (4)
(9,083)— — (9,083)
Management restructuring costs (5)
— — 7,720 7,720 
Loss on partial settlement of benefit obligations(1)— 6,447 6,446 
Amortization of acquired intangibles, net10,389 (13,578)— (3,189)
Adjusted EBITDA $316,006 $11,981 $(63,883)$264,104 
(1) Asset impairment for the year ended December 31, 2019 includes a long-lived asset impairment of $60,169 related to asset groups recorded within the Met and CAPP - Thermal reporting segments and an asset impairment of $6,155 primarily related to the write-off of prepaid purchased coal as a result of Blackjewel’s Chapter 11 bankruptcy filing on July 1, 2019. Refer to Note 8 for further information.
(2) The goodwill impairment testing as of December 31, 2019 resulted in a goodwill impairment of $124,353 to write down the full carrying value of goodwill. Refer to Note 2 for further information.
(3) The cost impact of the coal inventory fair value adjustment as a result of the Merger was completed during the three months ended June 30, 2019.
(4) During the year ended December 31, 2019, the Company entered into an exchange transaction which primarily included the release of the PRB overriding royalty interest owed to the Company in exchange for met coal reserves which resulted in a gain of $9,083.
(5) Management restructuring costs are related to severance expense associated with senior management changes in the year ended December 31, 2019.
v3.20.4
Business and Basis of Presentation (Details) - USD ($)
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Mar. 20, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Outstanding borrowings $ 599,573,000        
Deferred payroll taxes 15,109,000        
AMT credit refund received, CARES Act 66,130,000        
Forecast          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Payroll Taxes Payable, CARES Act   $ 7,554,000 $ 7,554,000    
ABL Facility - due April 2022 | ABL Facility - due April 2022          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Total long-term debt, gross         $ 0
ABL Facility - due April 2022 | ABL Facility - due April 2022 | Revolving Credit Facility          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Outstanding borrowings 3,350,000     $ 57,500,000 $ 0
Total long-term debt, gross $ 3,350,000        
v3.20.4
Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2020
Dec. 31, 2018
Nov. 09, 2018
Jul. 26, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Cash and cash equivalents $ 139,227       $ 139,227 $ 212,803        
Total restricted cash 105,344       105,344 134,887        
Short-term restricted cash 9,311       9,311 12,363        
Restricted investments 23,768       23,768 19,399        
Long-term deposits 28,247       28,247 10,310        
Owned and leased mineral rights 463,250       463,250 523,012        
Asset retirement obligation assets 10,491       10,491 36,723        
Impairment of long-lived assets 29,636 $ 219 $ 17,390 $ 33,709 80,954 60,169        
Depletion         (13,746) 14,551        
Amortization of intangibles         10,075 (88)        
Goodwill impairment         0 124,353        
Worker's compensation discount $ 24,061       $ 24,061 $ 24,680        
Number of warrants outstanding (in shares) 801,370       801,370 801,370       810,811
Exercise price of warrants (in dollars per share) $ 46.911       $ 46.911 $ 46.911       $ 55.93
Common stock, par value (in dollars per share) $ 0.01       $ 0.01 $ 0.01       $ 0.01
Number of securities called by each warrant (in shares) 1.15       1.15 1.15       1
Number of securities called by outstanding warrants (in shares) 921,576       921,576 921,576        
Shares issued upon exercise of warrants (in shares)           414        
Shares withheld upon exercise of warrants (in shares)           5        
Equity method investments $ 18,383       $ 18,383 $ 18,413        
Cumulative-effect adjustment to retained earnings (200,102)       (200,102) (696,122)   $ (1,071,140)    
Goodwill           0   95,624    
Revisions in estimated cash flows         (43,765) (7,162)        
Alpha Companies                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Goodwill                 $ 124,353  
Retained Earnings (Accumulated Deficit)                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Cumulative-effect adjustment to retained earnings 360,529       360,529 (86,810)   $ (403,129)    
Cumulative Effect, Period of Adoption, Adjustment                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Cumulative-effect adjustment to retained earnings           440        
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings (Accumulated Deficit)                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Cumulative-effect adjustment to retained earnings           440 $ 440      
Mineral rights                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Impairment of long-lived assets 17,513 0 2,241 21,825 41,579 35,445        
Revisions in estimated cash flows         (34,377) (7,162)        
Acquired mine permits, net                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Impairment of long-lived assets 6,673 $ 0 $ 8,653 $ 5,818 $ 21,144 5,997        
Long-lived assets related to asset retirement obligations                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Impairment of long-lived assets           1,671        
Mining equipment, buildings and other fixed assets | Minimum                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Property, plant and equipment, useful lives         1 year          
Mining equipment, buildings and other fixed assets | Maximum                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Property, plant and equipment, useful lives         25 years          
Trading Securities                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Restricted investments 22,498       $ 22,498 11,021        
Held-to-maturity Securities                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Restricted investments 1,270       1,270 8,378        
Worker's compensation                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Restricted investments 51       51 613        
Reclamation-related obligations                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Total restricted cash 8,445       8,445 67,868        
Restricted investments 22,233       22,233 18,786        
Long-term deposits 25,633       25,633 8,887        
Financial payments and other performance obligations                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Total restricted cash 17,863       17,863 3,006        
Restricted investments 1,484       1,484 0        
Long-term deposits 1,596       1,596          
Contingent Revenue Obligation                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Total restricted cash 9,311       9,311 12,363        
Short-term restricted cash 9,311       9,311 12,363        
Other operating agreements                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Long-term deposits 1,018       1,018 1,423        
Workers’ compensation and black lung obligations                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Total restricted cash $ 69,725       $ 69,725 $ 51,650        
v3.20.4
Summary of Significant Accounting Policies - Acquired Intangible Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Assets $ 88,196 $ 124,246
Liabilities (327) (6,018)
Assets, net 87,869 118,228
Coal supply agreements, net    
Finite-Lived Intangible Assets [Line Items]    
Assets 0 18
Acquired mine permits, net    
Finite-Lived Intangible Assets [Line Items]    
Assets 88,196 124,228
Coal supply agreements, net    
Finite-Lived Intangible Assets [Line Items]    
Liabilities (327) (6,018)
Acquired mine permits, net    
Finite-Lived Intangible Assets [Line Items]    
Liabilities 0 0
Coal supply agreements, net    
Finite-Lived Intangible Assets [Line Items]    
Liabilities, net (327) (6,000)
Acquired mine permits, net    
Finite-Lived Intangible Assets [Line Items]    
Assets, net $ 88,196 $ 124,228
v3.20.4
Summary of Significant Accounting Policies - Amortization of Mine Permits Acquired (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Amortization of mine permits $ 9,214 $ (3,189)
Amortization of acquired intangibles, net 10,075 (88)
Mining Permits [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortization of mine permits 14,887 23,921
Coal supply agreements, net    
Finite-Lived Intangible Assets [Line Items]    
Amortization of mine permits 18 783
Amortization of intangible liabilities (5,691) (27,893)
Amortization of acquired intangibles, net $ (5,673) $ (27,110)
v3.20.4
Summary of Significant Accounting Policies - Future Amortization Expense of Acquired Intangibles (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Accounting Policies [Abstract]  
2021 $ 9,712
2022 10,039
2023 10,028
2024 8,677
2025 8,672
Thereafter 40,741
Total net future amortization expense $ 87,869
v3.20.4
Summary of Significant Accounting Policies - Changes in Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Beginning balance $ 0 $ 95,624
Impairments $ 0 (124,353)
Ending balance   0
Alpha Companies    
Goodwill [Roll Forward]    
Measurement-Period Adjustments   $ 28,729
v3.20.4
Summary of Significant Accounting Policies - ASC 842 (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating lease right-of-use assets $ 5,671 $ 7,298 $ 10,136 $ 0
Financing lease assets       9,786
Financing lease assets 4,262 9,687 9,786  
Total lease assets 9,933 16,985 19,922  
Operating lease liabilities - current 595 1,402 3,232 0
Financing lease liabilities - current       $ 2,110
Financing lease liabilities - current $ 2,014 $ 3,266 $ 2,110  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent
Operating lease liabilities - long-term $ 5,076 $ 5,896 $ 6,904 $ 0
Financing lease liabilities - long-term       4,313
Financing lease liabilities - long-term 1,996 4,651 4,313  
Total lease liabilities       $ 6,423
Total lease liabilities $ 9,681 $ 15,215 $ 16,559  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] ctra:AccruedLiabilitiesAndOtherLiabilitiesCurrent ctra:AccruedLiabilitiesAndOtherLiabilitiesCurrent ctra:AccruedLiabilitiesAndOtherLiabilitiesCurrent ctra:AccruedLiabilitiesAndOtherLiabilitiesCurrent
Adjustments | Accounting Standards Update 2016-02        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating lease right-of-use assets     $ 10,136  
Financing lease assets     0  
Total lease assets     10,136  
Operating lease liabilities - current     3,232  
Financing lease liabilities - current     0  
Operating lease liabilities - long-term     6,904  
Financing lease liabilities - long-term     0  
Total lease liabilities     $ 10,136  
v3.20.4
Discontinued Operations - Cumberland Transaction (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Cash $ 52,192 $ 0
Loss on sale 36,113 $ 0
Cumberland Transaction | Discontinued Operations, Disposed of by Sale    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Cash 19,987  
Surety bonding collateral 30,000  
Total consideration 49,987  
Transaction costs 2,205  
Carrying value of transferred assets and liabilities (16,079)  
Loss on sale 36,113  
Property, plant and equipment, net 32,872  
Deferred longwall move expenses 15,173  
Coal and supplies inventory 5,112  
Asset retirement obligations assumed 39,573  
Severance 17,143  
Black lung obligations 8,290  
Subsidence liability $ 3,559  
v3.20.4
Discontinued Operations - Narrative (Details)
T in Thousands, $ in Thousands
 12 Months Ended
Oct. 18, 2019
USD ($)
Dec. 31, 2022
USD ($)
T
Dec. 31, 2021
USD ($)
T
Dec. 31, 2020
USD ($)
T
Dec. 31, 2019
USD ($)
T
May 29, 2020
USD ($)
Guarantor Obligations [Line Items]            
Depreciation, depletion and amortization         $ 145,913  
PRB Transaction | Discontinued Operations            
Guarantor Obligations [Line Items]            
Consideration           $ 625
Cumberland Back-to-Back Coal Supply Agreement            
Guarantor Obligations [Line Items]            
Purchased and sold, tons | T       104    
Purchased and sold       $ 3,997    
Cumberland Back-to-Back Coal Supply Agreement | Forecast            
Guarantor Obligations [Line Items]            
Purchased and sold, tons | T   2,615 2,681      
Purchased and sold   $ 101,990 $ 104,051      
PBR Back-to-Back Coal Supply Agreement            
Guarantor Obligations [Line Items]            
Purchased and sold, tons | T       1,149 929  
Purchased and sold       $ 11,682 $ 9,941  
Eagle Specialty Materials, LLC            
Guarantor Obligations [Line Items]            
Back taxes paid $ 13,500          
v3.20.4
Discontinued Operations - Details of ESM Transactions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
ARO liabilities transferred $ 203,137 $ 165,064 $ 192,038
Eagle Specialty Materials, LLC      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash 90,000    
DIP obligation 3,008    
Other 331    
Total consideration 93,339    
Gain on sale (59,543)    
Eagle Butte and Belle Ayr Mines | Eagle Specialty Materials, LLC      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
ARO liabilities transferred $ 152,882    
v3.20.4
Discontinued Operations - Major Components of Net Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Costs and expenses:    
Depreciation, depletion and amortization   $ 145,913
Cumberland and PRB Transaction | Discontinued Operations    
Revenues:    
Total revenues $ 235,509 289,206
Costs and expenses:    
Cost of coal sales (exclusive of items shown separately below) 215,390 256,336
Depreciation, depletion and amortization 11,570 99,405
Accretion on asset retirement obligations 4,154 9,894
Selling, general and administrative expenses 1,623 4,349
Other (income) expenses (926)  
Other (income) expenses   4,742
Other non-major expense items, net 374 2,504
Loss on sale 36,113 0
Loss from discontinued operations before income taxes $ (205,429) (105,185)
PRB Transaction    
Costs and expenses:    
Accretion on asset retirement obligations   5,961
Eagle Specialty Materials, LLC    
Costs and expenses:    
Gain on sale   $ (59,543)
v3.20.4
Discontinued Operations - Major Components of Asset and Liabilities (Details) - Cumberland and PRB Transaction - Discontinued Operations - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets:    
Trade accounts receivable, net of allowance for doubtful accounts $ 7,504 $ 20,493
Inventory, net 0 11,771
Prepaid expenses and other current assets 3,431 13,628
Property, plant, and equipment, net of accumulated depreciation and amortization 0 146,864
Other non-current assets 9,473 15,760
Liabilities:    
Trade accounts payable, accrued expenses and other current liabilities 7,433 24,769
Asset retirement obligations 0 21,568
Workers’ compensation and black lung obligations 32,672 36,149
Other non-current liabilities $ 1,291 $ 4,593
v3.20.4
Discontinued Operations - Major Components of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Depreciation, depletion and amortization   $ 145,913
Cumberland and PRB Transaction | Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Depreciation, depletion and amortization $ 11,570 99,405
Capital expenditures 34,411 31,964
Other significant operating non-cash items related to discontinued operations:    
Accretion on asset retirement obligations 4,154 9,894
Asset impairment and restructuring $ 172,640 $ 17,161
v3.20.4
Revenue - Disaggregation of Revenue by Segment (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
segment
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Revenue from Contract with Customer [Abstract]      
Number of reportable segments | segment 3 2  
Disaggregation of Revenue [Line Items]      
Revenues   $ 1,413,124 $ 1,995,934
Met Coal      
Disaggregation of Revenue [Line Items]      
Revenues   1,232,775 1,726,748
Thermal Coal      
Disaggregation of Revenue [Line Items]      
Revenues   180,349 269,186
Export coal revenues      
Disaggregation of Revenue [Line Items]      
Revenues   898,025 1,223,108
Export coal revenues | Met Coal      
Disaggregation of Revenue [Line Items]      
Revenues   870,121 1,174,942
Export coal revenues | Thermal Coal      
Disaggregation of Revenue [Line Items]      
Revenues   27,904 48,166
Domestic coal revenues      
Disaggregation of Revenue [Line Items]      
Revenues   515,099 772,826
Domestic coal revenues | Met Coal      
Disaggregation of Revenue [Line Items]      
Revenues   362,654 551,806
Domestic coal revenues | Thermal Coal      
Disaggregation of Revenue [Line Items]      
Revenues   $ 152,445 $ 221,020
v3.20.4
Revenue Revenue - Performance Obligations (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Disaggregation of Revenue [Line Items]  
Estimated coal revenues $ 141,676
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Disaggregation of Revenue [Line Items]  
Estimated coal revenues $ 113,676
Estimated coal revenues, period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Disaggregation of Revenue [Line Items]  
Estimated coal revenues $ 28,000
Estimated coal revenues, period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Disaggregation of Revenue [Line Items]  
Estimated coal revenues $ 0
Estimated coal revenues, period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Disaggregation of Revenue [Line Items]  
Estimated coal revenues $ 0
Estimated coal revenues, period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01  
Disaggregation of Revenue [Line Items]  
Estimated coal revenues $ 0
Estimated coal revenues, period 1 year
v3.20.4
Accumulated Other Comprehensive (Loss) Income - Changes to Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 696,122 $ 1,071,140
Ending balance 200,102 696,122
Employee benefit costs    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (58,616) (23,130)
Other comprehensive loss before reclassifications (60,647) (42,891)
Amounts reclassified from accumulated other comprehensive loss 7,278 7,405
Ending balance $ (111,985) $ (58,616)
v3.20.4
Accumulated Other Comprehensive (Loss) Income - Summary of Amounts Reclassified (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Employee benefit costs:    
Loss from continuing operations before income taxes $ (243,634) $ (272,905)
Income tax benefit 2,164 53,287
Net loss (446,899) (316,319)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss    
Employee benefit costs:    
Miscellaneous income 3,929 959
Reclassification out of Accumulated Other Comprehensive Income | Settlement    
Employee benefit costs:    
Miscellaneous income 3,349 6,446
Reclassification out of Accumulated Other Comprehensive Income | Employee benefit costs    
Employee benefit costs:    
Loss from continuing operations before income taxes 7,278 7,405
Income tax benefit 0 0
Net loss $ 7,278 $ 7,405
v3.20.4
Net Loss per Share - Narrative (Details) - shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]    
Antidilutive securities excluded from computation of earnings per share (in shares) 1,317,351 537,918
Weighted-average antidilutive securities excluded from computation of earnings per share (in shares) 142,250 256,668
v3.20.4
Inventories, net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Inventory [Line Items]    
Total inventories, net $ 108,051 $ 150,888
Allowance for obsolete materials and supplies inventory 807  
Coal revenues    
Inventory [Line Items]    
Raw coal 15,084 26,584
Saleable coal 69,262 100,275
Materials, supplies and other, net (1)    
Inventory [Line Items]    
Materials, supplies and other, net (1) $ 23,705 $ 24,029
v3.20.4
Asset Impairment and Restructuring - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
assetGroup
Dec. 31, 2019
USD ($)
assetGroup
Impaired Long-Lived Assets Held and Used [Line Items]            
Impairment of long-lived assets $ 29,636 $ 219 $ 17,390 $ 33,709 $ 80,954 $ 60,169
Asset impairment related to write-off of prepaid purchased coal           6,155
Long-lived asset impairments, discontinued operations 0 3,297 144,348 0 $ 147,645 17,161
Discontinued Operations            
Impaired Long-Lived Assets Held and Used [Line Items]            
Number of assets impaired | assetGroup         1  
Met            
Impaired Long-Lived Assets Held and Used [Line Items]            
Number of assets impaired | assetGroup         5  
Impairment of long-lived assets 13,366 0 0 32,951 $ 46,317  
Met | Operating segments            
Impaired Long-Lived Assets Held and Used [Line Items]            
Impairment of long-lived assets           $ 9,176
CAPP - Thermal            
Impaired Long-Lived Assets Held and Used [Line Items]            
Number of assets impaired | assetGroup         3 3
Impairment of long-lived assets 16,270 219 17,385 758 $ 34,632  
CAPP - Thermal | Operating segments            
Impaired Long-Lived Assets Held and Used [Line Items]            
Impairment of long-lived assets           $ 50,993
Mineral rights            
Impaired Long-Lived Assets Held and Used [Line Items]            
Impairment of long-lived assets 17,513 0 2,241 21,825 41,579 35,445
Long-lived asset impairments, discontinued operations 0 0 16,364 0 16,364  
Property, plant and equipment, net            
Impaired Long-Lived Assets Held and Used [Line Items]            
Impairment of long-lived assets 5,450 219 6,496 6,066 18,231 17,056
Long-lived asset impairments, discontinued operations 0 3,297 127,984 0 131,281  
Acquired mine permits, net            
Impaired Long-Lived Assets Held and Used [Line Items]            
Impairment of long-lived assets $ 6,673 $ 0 $ 8,653 $ 5,818 $ 21,144 5,997
Long-lived assets related to asset retirement obligations            
Impaired Long-Lived Assets Held and Used [Line Items]            
Impairment of long-lived assets           $ 1,671
v3.20.4
Asset Impairment and Restructuring - Long-Lived Asset Impairments (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Impaired Long-Lived Assets Held and Used [Line Items]            
Long-lived asset impairments, continuing operations $ 29,636 $ 219 $ 17,390 $ 33,709 $ 80,954 $ 60,169
Long-lived asset impairments, discontinued operations 0 3,297 144,348 0 147,645 17,161
Total long-lived asset impairment 29,636 3,516 161,738 33,709 228,599  
Mineral rights            
Impaired Long-Lived Assets Held and Used [Line Items]            
Long-lived asset impairments, continuing operations 17,513 0 2,241 21,825 41,579 35,445
Long-lived asset impairments, discontinued operations 0 0 16,364 0 16,364  
Total long-lived asset impairment 17,513 0 18,605 21,825 57,943  
Property, plant and equipment, net            
Impaired Long-Lived Assets Held and Used [Line Items]            
Long-lived asset impairments, continuing operations 5,450 219 6,496 6,066 18,231 17,056
Long-lived asset impairments, discontinued operations 0 3,297 127,984 0 131,281  
Total long-lived asset impairment 5,450 3,516 134,480 6,066 149,512  
Acquired mine permits, net            
Impaired Long-Lived Assets Held and Used [Line Items]            
Long-lived asset impairments, continuing operations 6,673 0 8,653 5,818 21,144 $ 5,997
Total long-lived asset impairment 6,673 0 8,653 5,818 21,144  
Met            
Impaired Long-Lived Assets Held and Used [Line Items]            
Long-lived asset impairments, continuing operations 13,366 0 0 32,951 46,317  
CAPP - Thermal            
Impaired Long-Lived Assets Held and Used [Line Items]            
Long-lived asset impairments, continuing operations 16,270 219 17,385 758 34,632  
All Other            
Impaired Long-Lived Assets Held and Used [Line Items]            
Long-lived asset impairments, continuing operations $ 0 $ 0 $ 5 $ 0 $ 5  
v3.20.4
Asset Impairment and Restructuring - Restructuring Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]      
Restructuring expense     $ 6,155
Allowance for obsolete materials and supplies inventory   $ 807  
Strategic Actions with Respect to Two Thermal Coal Mining Complexes      
Restructuring Cost and Reserve [Line Items]      
Management restructuring costs   26,037  
Other costs   1,882  
Restructuring expense $ 2,924 27,919  
Deferred longwall move expenses   668  
Allowance for advanced mining royalties   407  
Allowance for obsolete materials and supplies inventory   807  
Strategic Actions with Respect to Two Thermal Coal Mining Complexes | Continuing operations      
Restructuring Cost and Reserve [Line Items]      
Management restructuring costs   2,117  
Other costs   807  
Restructuring expense   2,924  
Strategic Actions with Respect to Two Thermal Coal Mining Complexes | Discontinued Operations      
Restructuring Cost and Reserve [Line Items]      
Management restructuring costs   23,920  
Other costs   1,075  
Restructuring expense   24,995  
All Other | Strategic Actions with Respect to Two Thermal Coal Mining Complexes      
Restructuring Cost and Reserve [Line Items]      
Restructuring expense   837  
CAPP - Thermal | Operating segments | Strategic Actions with Respect to Two Thermal Coal Mining Complexes      
Restructuring Cost and Reserve [Line Items]      
Restructuring expense   $ 2,087  
v3.20.4
Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid freight $ 8,515 $ 8,268
Notes and other receivables 13,245 8,447
Short-term restricted cash 9,311 12,363
Short-term deposits 47 689
Prepaid insurance 6,510 9,591
Refundable income taxes 64,565 33,915
Prepaid bond premium 2,576 2,454
Other prepaid expenses 1,483 1,996
Total prepaid expenses and other current assets $ 106,252 $ 77,723
v3.20.4
Property, Plant, and Equipment, Net - Schedule of Property, Plant, and Equipment, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Total property, equipment and mine development costs $ 746,043 $ 692,776
Less accumulated depreciation, depletion and amortization 382,423 256,378
Total property, plant, and equipment, net 363,620 436,398
Plant and mining equipment    
Property, Plant and Equipment [Line Items]    
Total property, equipment and mine development costs 603,463 600,495
Mine development    
Property, Plant and Equipment [Line Items]    
Total property, equipment and mine development costs 96,008 36,721
Land    
Property, Plant and Equipment [Line Items]    
Total property, equipment and mine development costs 26,606 30,506
Office equipment, software and other    
Property, Plant and Equipment [Line Items]    
Total property, equipment and mine development costs 1,379 1,396
Construction in progress    
Property, Plant and Equipment [Line Items]    
Total property, equipment and mine development costs $ 18,587 $ 23,658
v3.20.4
Property, Plant, and Equipment, Net - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Property, Plant and Equipment [Line Items]              
Financing lease assets $ 4,262       $ 4,262 $ 9,687 $ 9,786
Depreciation, depletion and amortization associated with property, plant and equipment         153,631 201,206  
Revisions to asset retirement obligations         43,765 7,162  
Impairment of long-lived assets 29,636 $ 219 $ 17,390 $ 33,709 80,954 60,169  
Depreciation, Depletion and Amortization [Member]              
Property, Plant and Equipment [Line Items]              
Revisions to asset retirement obligations         (3,689) (1,522)  
Plant and mining equipment              
Property, Plant and Equipment [Line Items]              
Plant and mining equipment 7,907       7,907 14,328  
Finance Lease, Right-of-Use Asset, Accumulated Amortization 3,645       3,645 4,641  
Equipment Purchase Commitments              
Property, Plant and Equipment [Line Items]              
Purchase commitment, 2021 5,008       5,008    
Purchase commitment, 2023 170       170    
Property, plant and equipment, net              
Property, Plant and Equipment [Line Items]              
Impairment of long-lived assets $ 5,450 $ 219 $ 6,496 $ 6,066 $ 18,231 $ 17,056  
v3.20.4
Other Non-Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]        
Operating lease right-of-use assets $ 5,671 $ 7,298 $ 10,136 $ 0
Long-term deposits 28,200 9,621    
Long-term restricted investments 23,768 19,399    
Equity method investments 18,383 18,413    
Federal income tax receivable 0 64,160    
Workers’ compensation receivables 48,320 52,757    
Other 25,040 17,827    
Total other non-current assets $ 149,382 $ 189,475    
v3.20.4
Leases - Right-of-use Assets and Lease Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Assets        
Financing lease assets $ 4,262 $ 9,687 $ 9,786  
Operating lease right-of-use assets 5,671 7,298 10,136 $ 0
Total lease assets 9,933 16,985 19,922  
Liabilities        
Financing lease liabilities - current 2,014 3,266 2,110  
Operating lease liabilities - current 595 1,402 3,232 0
Financing lease liabilities - long-term $ 1,996 $ 4,651 4,313  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligations us-gaap:LongTermDebtAndCapitalLeaseObligations    
Operating lease liabilities - long-term $ 5,076 $ 5,896 $ 6,904 $ 0
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent
Total lease liabilities $ 9,681 $ 15,215 $ 16,559  
v3.20.4
Leases - Lease Costs and Other Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Financing lease cost:        
Amortization of leased assets $ 3,238,000 $ 3,738,000    
Interest on lease liabilities 358,000 477,000    
Operating lease cost 2,105,000 2,389,000    
Short-term lease cost 1,518,000 1,851,000    
Total lease cost 7,219,000 8,455,000    
Sublease income 0 0    
Variable lease income 0 0    
Other information        
Cash paid for amounts included in the measurement of lease liabilities 7,157,000 8,349,000    
Operating cash flows from financing leases 358,000 463,000    
Operating cash flows from operating leases 3,623,000 4,240,000    
Financing cash flows from financing leases 3,176,000 3,646,000    
Right-of-use assets obtained in exchange for new financing lease liabilities 221,000 1,429,000    
Right-of-use assets obtained in exchange for new operating lease liabilities $ (12,000) $ 371,000    
Lease Term and Discount Rate        
Weighted-average remaining lease term in months - financing leases 1 year 11 months 9 days 2 years 9 months 21 days    
Weighted-average remaining lease term in months - operating leases 8 years 5 months 12 days 8 years 9 months 3 days    
Weighted-average discount rate - financing leases 6.10% 5.40%    
Weighted-average discount rate - operating leases 11.50% 11.40%    
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] ctra:AccruedLiabilitiesAndOtherLiabilitiesCurrent ctra:AccruedLiabilitiesAndOtherLiabilitiesCurrent ctra:AccruedLiabilitiesAndOtherLiabilitiesCurrent ctra:AccruedLiabilitiesAndOtherLiabilitiesCurrent
v3.20.4
Leases - Maturities of Lease Liabilities (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Financing Leases  
2021 $ 2,210
2022 1,827
2023 269
2024 6
2025 0
Thereafter 0
Total future minimum lease payments 4,312
Imputed interest (302)
Present value of future minimum lease payments 4,010
Operating Leases  
2021 1,210
2022 1,076
2023 1,101
2024 982
2025 897
Thereafter 4,018
Total future minimum lease payments 9,284
Imputed interest (3,613)
Present value of future minimum lease payments $ 5,671
v3.20.4
Stock Repurchase and Dividend (Details) - USD ($)
 1 Months Ended 12 Months Ended
Sep. 12, 2019
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Aug. 29, 2019
May 31, 2019
Debt Instrument [Line Items]            
Shares repurchased, net     $ 970,000 $ 37,622,000    
Common Stock | Capital Return Program            
Debt Instrument [Line Items]            
Authorized share repurchases           $ 250,000,000
Common Stock | Company Repurchase Plan            
Debt Instrument [Line Items]            
Authorized share repurchases         $ 100,000,000  
Shares repurchased (in shares)   529,303,000        
Shares repurchased, net   $ 15,969,000        
Shares repurchased, gross   15,953,000        
Fees related to stock repurchase   $ 16,000        
Share repurchase price (in dollars per share)   $ 30.17        
Common Stock | Affiliated Entity | Stockholders Common Stock Repurchase Agreement            
Debt Instrument [Line Items]            
Shares repurchased (in shares) 500,000          
Shares repurchased, net $ 16,495,000          
Share repurchase price (in dollars per share) $ 32.99          
v3.20.4
Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Wages and benefits $ 40,330 $ 37,983
Workers’ compensation 10,355 11,317
Taxes other than income taxes 21,540 24,662
Current portion of asset retirement obligations 24,990 38,731
Accrued interest and fees 15,902 4,362
Deferred revenue 13,197 0
Freight accrual 2,610 5,851
Other 4,698 9,164
Accrued expenses and other current liabilities 140,406 139,479
Black lung    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Workers’ compensation 10,355 11,317
Black lung $ 6,784 $ 7,409
v3.20.4
Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Debt discount and issuance costs $ (17,046) $ (29,695)
Total long-term debt 582,527 592,934
Less current portion (28,830) (28,476)
Long-term debt, net of current portion 553,697 564,458
Term Loan Credit Facility - due June 2024 | Term Loan Credit Facility - due June 2024    
Debt Instrument [Line Items]    
Total long-term debt, gross 553,373 558,991
ABL Facility - due April 2022 | ABL Facility - due April 2022    
Debt Instrument [Line Items]    
Total long-term debt, gross   0
ABL Facility - due April 2022 | ABL Facility - due April 2022 | Revolving Credit Facility    
Debt Instrument [Line Items]    
Total long-term debt, gross 3,350  
Note Payable | LCC Note Payable    
Debt Instrument [Line Items]    
Total long-term debt, gross 27,500 45,000
Less current portion (17,500) (17,500)
Note Payable | LCC Water Treatment Obligation    
Debt Instrument [Line Items]    
Total long-term debt, gross 6,875 9,375
Less current portion (1,875) (1,875)
Other    
Debt Instrument [Line Items]    
Total long-term debt, gross $ 8,475 $ 9,263
v3.20.4
Long-Term Debt - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jun. 14, 2019
Nov. 09, 2018
Jan. 31, 2021
Dec. 31, 2020
Mar. 20, 2020
Dec. 31, 2019
Debt Instrument [Line Items]            
Current portion of long-term debt       $ 28,830,000   $ 28,476,000
Outstanding borrowings       599,573,000    
Long-term debt, net of current portion       553,697,000   564,458,000
Term Loan Credit Facility - due June 2024 | Term Loan Credit Facility - due June 2024            
Debt Instrument [Line Items]            
Aggregate amount of debt $ 561,800,000          
Principal payments due in March, June, September and December 1,405,000          
Outstanding borrowings       540,643,000    
Current maturities       $ 5,618,000    
Term Loan Credit Facility - due June 2024 | Term Loan Credit Facility - due June 2024 | Eurocurrency            
Debt Instrument [Line Items]            
Variable interest rate       7.00%    
Interest rate at period end       9.00%    
Term Loan Credit Facility - due June 2024 | Term Loan Facility Due 2025            
Debt Instrument [Line Items]            
Loans repaid 543,125,000          
Loss on modification of debt 255,000          
Loss on modification and extinguishment of debt $ 26,204,000          
Secured Debt | Term Loan Credit Facility - due June 2024            
Debt Instrument [Line Items]            
Outstanding borrowings           538,765,000
Current maturities           5,618,000
Secured Debt | Term Loan Credit Facility - due June 2024 | Eurocurrency            
Debt Instrument [Line Items]            
Variable floor rate 2.00%          
Note Payable | LCC Note Payable            
Debt Instrument [Line Items]            
Aggregate amount of debt   $ 62,500,000        
Current portion of long-term debt       $ 17,500,000   17,500,000
Outstanding borrowings       $ 24,423,000   37,695,000
Imputed interest rate       12.45%    
Annual debt repayments   17,500,000        
Final debt repayment   10,000,000        
Note Payable | LCC Water Treatment Obligation            
Debt Instrument [Line Items]            
Aggregate amount of debt   12,500,000        
Current portion of long-term debt       $ 1,875,000   1,875,000
Outstanding borrowings       $ 5,636,000   7,211,000
Imputed interest rate       13.12%    
Annual debt repayments   625,000        
Revolving Credit Facility | ABL Facility - due April 2022 | ABL Facility - due April 2022            
Debt Instrument [Line Items]            
Outstanding borrowings       $ 3,350,000 $ 57,500,000 0
Amount of credit facility   $ 225,000,000        
Fronting fee percent   0.25%        
Letters of credit outstanding       $ 123,108,000   $ 99,876,000
Revolving Credit Facility | ABL Facility - due April 2022 | ABL Facility - due April 2022 | Minimum            
Debt Instrument [Line Items]            
Commitment fee   0.25%        
Revolving Credit Facility | ABL Facility - due April 2022 | ABL Facility - due April 2022 | Maximum            
Debt Instrument [Line Items]            
Commitment fee   0.375%        
Revolving Credit Facility | ABL Facility - due April 2022 | ABL Facility - due April 2022 | Base Rate            
Debt Instrument [Line Items]            
Variable interest rate       2.50%    
Interest rate at period end       2.73%    
Revolving Credit Facility | ABL Facility - due April 2022 | ABL Facility - due April 2022 | Base Rate | Minimum            
Debt Instrument [Line Items]            
Variable interest rate   1.00%        
Revolving Credit Facility | ABL Facility - due April 2022 | ABL Facility - due April 2022 | Base Rate | Maximum            
Debt Instrument [Line Items]            
Variable interest rate   1.50%        
Revolving Credit Facility | ABL Facility - due April 2022 | ABL Facility - due April 2022 | Eurocurrency | Minimum            
Debt Instrument [Line Items]            
Variable interest rate   2.00%        
Revolving Credit Facility | ABL Facility - due April 2022 | ABL Facility - due April 2022 | Eurocurrency | Maximum            
Debt Instrument [Line Items]            
Variable interest rate   2.50%        
Letter of Credit | ABL Facility - due April 2022 | ABL Facility - due April 2022            
Debt Instrument [Line Items]            
Amount of credit facility   $ 200,000,000        
Letter of Credit | ABL Facility - due April 2022 | ABL Facility - due April 2022 | Subsequent Event            
Debt Instrument [Line Items]            
Collateral posted     $ 25,000,000      
Debt Instrument, Interest Rate, Period One | Term Loan Credit Facility - due June 2024 | Term Loan Credit Facility - due June 2024 | Base Rate            
Debt Instrument [Line Items]            
Variable interest rate 6.00%          
Debt Instrument, Interest Rate, Period One | Term Loan Credit Facility - due June 2024 | Term Loan Credit Facility - due June 2024 | Eurocurrency            
Debt Instrument [Line Items]            
Variable interest rate 7.00%          
Debt Instrument, Interest Rate, Period Two | Term Loan Credit Facility - due June 2024 | Term Loan Credit Facility - due June 2024 | Base Rate | Minimum            
Debt Instrument [Line Items]            
Variable interest rate 7.00%          
Debt Instrument, Interest Rate, Period Two | Term Loan Credit Facility - due June 2024 | Term Loan Credit Facility - due June 2024 | Eurocurrency | Maximum            
Debt Instrument [Line Items]            
Variable interest rate 8.00%          
v3.20.4
Long-Term Debt - Schedule of Long-Term Debt Maturities (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Debt Disclosure [Abstract]  
2021 $ 28,830
2022 24,815
2023 9,300
2024 536,628
Total long-term debt $ 599,573
v3.20.4
Acquisition-Related Obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jul. 12, 2016
Fair Value, Option, Quantitative Disclosures [Line Items]      
Discount $ (1,491) $ (4,834)  
Total acquisition-related obligations 39,867 79,898  
Less current portion (19,099) (33,639)  
Acquisition-related obligations, net of current portion 20,768 46,259  
Contingent Revenue Obligation      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Total acquisition-related obligations 28,967 52,427  
Total acquisition-related obligations 28,967 52,427  
Less current portion (11,393) (14,646)  
Environmental Settlement Obligations      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Total acquisition-related obligations 10,391 16,305  
Discount (1,154) (2,711)  
Total acquisition-related obligations 9,237 13,594  
Less current portion (6,044) (6,185)  
Reclamation Funding Liability      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Total acquisition-related obligations 0 12,000 $ 50,000
Discount   (1,192)  
Less current portion   (10,808)  
UMWA Funds Settlement Liability      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Total acquisition-related obligations $ 2,000 $ 4,000  
v3.20.4
Acquisition-Related Obligations - Narrative (Details) - USD ($)
 3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Nov. 09, 2018
Jul. 12, 2016
Business Acquisition, Contingent Consideration [Line Items]            
Liabilities held for sale     $ 39,867,000 $ 79,898,000    
Acquisition related obligations, current     19,099,000 33,639,000    
Discount     1,491,000 4,834,000    
Contingent Revenue Obligation, Threshold One            
Business Acquisition, Contingent Consideration [Line Items]            
Percentage of revenue         1.50%  
Revenue threshold         $ 500,000,000  
Contingent Revenue Obligation, Threshold Two            
Business Acquisition, Contingent Consideration [Line Items]            
Percentage of revenue         1.00%  
Revenue threshold         $ 500,000,000  
Contingent Revenue Obligation            
Business Acquisition, Contingent Consideration [Line Items]            
Liabilities held for sale     28,967,000 52,427,000    
Acquisition related obligations, current     11,393,000 14,646,000    
Payment of contingent revenue obligation $ 15,084,000 $ 9,627,000        
Unclaimed unsecured claims $ 374,000          
Payments due     28,967,000 52,427,000    
Environmental Settlement Obligations            
Business Acquisition, Contingent Consideration [Line Items]            
Liabilities held for sale     9,237,000 13,594,000    
Acquisition related obligations, current     6,044,000 6,185,000    
Discount     1,154,000 2,711,000    
Payments due     10,391,000 16,305,000    
Reclamation Funding Liability            
Business Acquisition, Contingent Consideration [Line Items]            
Acquisition related obligations, current       10,808,000    
Discount       1,192,000    
Payments due     0 $ 12,000,000   $ 50,000,000
Payments due immediately           8,000,000
Payments due 2017           10,000,000
Payments due 2018           10,000,000
Payments due 2019           10,000,000
Payments due 2020           $ 12,000,000
Remaining payments     $ 0      
v3.20.4
Asset Retirement Obligation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]    
Total asset retirement obligations, beginning balance $ 203,137 $ 192,038
Measurement-period adjustments   12,718
Accretion for the period 26,504 23,852
Sites added during the period 621 5,112
Revisions in estimated cash flows (43,765) (7,162)
Expenditures for the period (21,433) (23,421)
Total assets retirement obligation, ending balance 165,064 203,137
Less current portion (24,990) (38,731)
Long-term portion $ 140,074 $ 164,406
v3.20.4
Fair Value of Financial Instruments and Fair Value Measurements - Total Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt $ 574,052 $ 583,671
Carrying Amount | Term Loan Agreement | Term Loan Credit Facility - due June 2024    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 540,643 538,765
Carrying Amount | Note Payable | LCC Note Payable    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 24,423 37,695
Carrying Amount | Note Payable | LCC Water Treatment Obligation    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 5,636 7,211
Carrying Amount | ABL Facility - due April 2022 | ABL Facility - due April 2022    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 3,350  
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 0 461,402
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 379,614 0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 27,666 40,164
Fair Value, Measurements, Nonrecurring | Term Loan Agreement | Term Loan Credit Facility - due June 2024 | Quoted Prices in Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 0 461,402
Fair Value, Measurements, Nonrecurring | Term Loan Agreement | Term Loan Credit Facility - due June 2024 | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 379,614 0
Fair Value, Measurements, Nonrecurring | Term Loan Agreement | Term Loan Credit Facility - due June 2024 | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 0 0
Fair Value, Measurements, Nonrecurring | Note Payable | LCC Note Payable | Quoted Prices in Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 0 0
Fair Value, Measurements, Nonrecurring | Note Payable | LCC Note Payable | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 0 0
Fair Value, Measurements, Nonrecurring | Note Payable | LCC Note Payable | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 20,328 33,884
Fair Value, Measurements, Nonrecurring | Note Payable | LCC Water Treatment Obligation | Quoted Prices in Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 0 0
Fair Value, Measurements, Nonrecurring | Note Payable | LCC Water Treatment Obligation | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 0 0
Fair Value, Measurements, Nonrecurring | Note Payable | LCC Water Treatment Obligation | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 4,281 6,280
Fair Value, Measurements, Nonrecurring | ABL Facility - due April 2022 | ABL Facility - due April 2022 | Quoted Prices in Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 0  
Fair Value, Measurements, Nonrecurring | ABL Facility - due April 2022 | ABL Facility - due April 2022 | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 0  
Fair Value, Measurements, Nonrecurring | ABL Facility - due April 2022 | ABL Facility - due April 2022 | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 3,057  
Fair Value, Measurements, Nonrecurring | Total Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 407,280 501,566
Fair Value, Measurements, Nonrecurring | Total Fair Value | Term Loan Agreement | Term Loan Credit Facility - due June 2024    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 379,614 461,402
Fair Value, Measurements, Nonrecurring | Total Fair Value | Note Payable | LCC Note Payable    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 20,328 33,884
Fair Value, Measurements, Nonrecurring | Total Fair Value | Note Payable | LCC Water Treatment Obligation    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt 4,281 $ 6,280
Fair Value, Measurements, Nonrecurring | Total Fair Value | ABL Facility - due April 2022 | ABL Facility - due April 2022    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total long-term debt $ 3,057  
v3.20.4
Fair Value of Financial Instruments and Fair Value Measurements - Acquisition-related Obligations at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value $ 10,899 $ 27,471
Carrying Amount | UMWA Funds Settlement Liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value 1,662 3,069
Carrying Amount | Reclamation Funding Liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value   10,808
Carrying Amount | Environmental Settlement Obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value 9,237 13,594
Fair Value, Measurements, Nonrecurring | Total Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value 9,186 25,784
Fair Value, Measurements, Nonrecurring | Total Fair Value | Quoted Prices in Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value 0 0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value 0 0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value 9,186 25,784
Fair Value, Measurements, Nonrecurring | Total Fair Value | UMWA Funds Settlement Liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value 1,426 2,929
Fair Value, Measurements, Nonrecurring | Total Fair Value | UMWA Funds Settlement Liability | Quoted Prices in Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value 0 0
Fair Value, Measurements, Nonrecurring | Total Fair Value | UMWA Funds Settlement Liability | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value 0 0
Fair Value, Measurements, Nonrecurring | Total Fair Value | UMWA Funds Settlement Liability | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value 1,426 2,929
Fair Value, Measurements, Nonrecurring | Total Fair Value | Reclamation Funding Liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value   10,658
Fair Value, Measurements, Nonrecurring | Total Fair Value | Reclamation Funding Liability | Quoted Prices in Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value   0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Reclamation Funding Liability | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value   0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Reclamation Funding Liability | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value   10,658
Fair Value, Measurements, Nonrecurring | Total Fair Value | Environmental Settlement Obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value 7,760 12,197
Fair Value, Measurements, Nonrecurring | Total Fair Value | Environmental Settlement Obligations | Quoted Prices in Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value 0 0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Environmental Settlement Obligations | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value 0 0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Environmental Settlement Obligations | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Fair Value $ 7,760 $ 12,197
v3.20.4
Fair Value of Financial Instruments and Fair Value Measurements - Schedule of Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Contingent Revenue Obligation $ 28,967 $ 52,427
Trading securities 22,498 11,021
Quoted Prices in Active Markets (Level 1)    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Contingent Revenue Obligation 0 0
Trading securities 20,092 5,506
Significant Other Observable Inputs (Level 2)    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Contingent Revenue Obligation 0 0
Trading securities 2,406 5,515
Significant Unobservable Inputs (Level 3)    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Contingent Revenue Obligation 28,967 52,427
Trading securities $ 0 $ 0
v3.20.4
Fair Value of Financial Instruments and Fair Value Measurements - Level 3 of the Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 52,427 $ 59,880
Payments (14,710) (9,627)
Gain Recognized in Earnings (8,750) (3,564)
Transfer In (Out) of Level 3 Fair Value Hierarchy 0 0
Ending balance 28,967 $ 52,427
Significant Unobservable Inputs (Level 3)    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Measurement-Period Adjustments $ 5,738  
v3.20.4
Fair Value of Financial Instruments and Fair Value Measurements - Level 3 Fair Value Measurements (Details)
$ in Billions
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Black Scholes | Forecasted future revenue | Minimum | Contingent Revenue Obligation    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Forecasted future revenue $ 0.9 $ 1.1
Black Scholes | Forecasted future revenue | Maximum | Contingent Revenue Obligation    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Forecasted future revenue $ 1.1 $ 1.2
Black Scholes | Stated royalty rate | Minimum | Contingent Revenue Obligation    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Acquisition-related obligation, measurement input 1.00% 1.00%
Black Scholes | Stated royalty rate | Maximum | Contingent Revenue Obligation    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Acquisition-related obligation, measurement input 1.50% 1.50%
Black Scholes | Annualized volatility | Minimum | Contingent Revenue Obligation    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Acquisition-related obligation, measurement input 19.40% 9.40%
Black Scholes | Annualized volatility | Maximum | Contingent Revenue Obligation    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Acquisition-related obligation, measurement input 52.10% 28.10%
Black Scholes | Annualized volatility | Weighted Average | Contingent Revenue Obligation    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Acquisition-related obligation, measurement input 28.00% 19.90%
Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow | Significant Unobservable Inputs (Level 3) | Measurement Input, Discount Rate | Notes Payable, Other Payables, Enviromental Settlement Obligations, Reclaimation Funding Liability, and United Mine Workers of America Funds Settlement Liability    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Long-term Debt and Acquisition-Related Obligations, Measurement Input 0.34 0.21
ABL Facility - due April 2022 | Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow | ABL Facility - due April 2022 | Significant Unobservable Inputs (Level 3) | Measurement Input, Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Long-term Debt, Measurement Input 0.09  
v3.20.4
Income Taxes - Total Income Tax Expense (Benefit) Provided on Income Before Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Continuing operations $ (2,164) $ (53,287)
Discontinued operations 0 (8,484)
Total $ (2,164) $ (61,771)
v3.20.4
Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Current tax (benefit) expense:    
Federal $ (35,187) $ (45,356)
State (99) 1,891
Total current (35,286) (43,465)
Deferred tax (benefit) expense:    
Federal 33,348 (747)
State (226) (9,075)
Total deferred 33,122 (9,822)
Total income tax benefit:    
Federal (1,839) (46,103)
State (325) (7,184)
Total $ (2,164) $ (53,287)
v3.20.4
Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Federal statutory income tax benefit $ (51,163) $ (57,310)
Increase (reductions) in taxes due to:    
Percentage depletion allowance (2,039) (6,270)
AMT sequestration refund (2,123) 0
State taxes, net of federal tax impact (9,640) (10,255)
State tax rate and NOL change, net of federal tax impact (1,235) (4,172)
Change in valuation allowances 59,929 10,936
Net operating loss carryback 0 (14,234)
Amended return - capital loss impact 0 919
Non-deductible goodwill impairment 0 26,114
Stock-based compensation 1,739 (1,085)
Other, net 2,368 2,070
Total $ (2,164) $ (53,287)
v3.20.4
Income Taxes - Deferred Income Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:      
Asset retirement obligations $ 41,268 $ 51,114  
Reserves and accruals not currently deductible 12,131 8,265  
Workers’ compensation benefit obligations 59,478 54,128  
Pension obligations 52,598 44,413  
Equity method investments 2,050 2,509  
Alternative minimum tax credit carryforwards 0 33,065  
Loss carryforwards, net of Section 382 limitation 255,772 142,510  
Acquisition-related obligations 10,002 17,902  
Other 10,976 12,299  
Gross deferred tax assets 444,275 366,205  
Less valuation allowance (263,387) (133,020) $ (94,802)
Deferred tax assets 180,888 233,185  
Deferred tax liabilities:      
Property, plant and mineral reserves (141,549) (145,487)  
Acquired intangibles, net (22,037) (27,140)  
Prepaid expenses (6,211) (6,780)  
Restricted cash (11,516) (20,313)  
Other (55) (822)  
Total deferred tax liabilities (181,368) (200,542)  
Net deferred tax assets $ (480)    
Net deferred tax assets   $ 32,643  
v3.20.4
Income Taxes - Valuation Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Valuation Allowance, Deferred Tax Asset, Increase (Decrease) [Roll Forward]    
Valuation allowance beginning of period $ 133,020 $ 94,802
Increase in valuation allowance recorded to income tax benefit 117,829 29,950
Increase in valuation allowance not affecting income tax expense 12,538 8,268
Valuation allowance end of period $ 263,387 $ 133,020
v3.20.4
Income Taxes - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Tax Credit Carryforward [Line Items]        
AMT credit refund received, CARES Act $ 66,130,000      
AMT credit refund received, other   $ 2,123,000    
Operating loss carryforwards 1,737,000,000 1,737,000,000    
Operating loss carryforwards available to offset regular federal taxable income 1,011,000,000 1,011,000,000    
Operating loss carryforwards section 382 limitation one 1,000,000 1,000,000    
Operating loss carryforwards subject to section 382 limitation one 56,000,000 56,000,000    
Operating loss carryforwards section 382 limitation two 18,300,000 18,300,000    
Operating loss carryforwards subject to section 382 limitation two 324,000,000 324,000,000    
Operating loss carryforwards section 382 limitation three 17,500,000 17,500,000    
Operating loss carryforwards, indefinite carryforwards 346,000,000 346,000,000    
Capital loss carryforwards section 382 limitation one 1,000,000 1,000,000    
Capital loss carryforwards subject to section 382 limitation two 51,000,000 51,000,000    
Capital loss carryforwards section 382 limitation two 17,500,000 17,500,000    
Reasonably possible decrease in unrecognized tax benefits 20,788,000 20,788,000    
Interest and penalties related to uncertain tax positions 0 0   $ 0
Prepaid Expenses and Other Current Assets        
Tax Credit Carryforward [Line Items]        
Federal income taxes receivable       33,065,000
Deferred tax assets related to AMT credits     $ 33,065,000 $ 33,065,000
AMT credit refund received, CARES Act 66,130,000      
Capital Loss Carryforward        
Tax Credit Carryforward [Line Items]        
Capital loss carryforwards 339,000,000 339,000,000    
Capital loss carryforwards subject to section 382 limitation one $ 65,000,000 $ 65,000,000    
v3.20.4
Income Taxes - Reconciliation for Uncertain Tax Position (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Unrecognized tax benefits - beginning of period $ 20,788 $ 0
Additions for tax positions of prior years 0 5,740
Additions for tax positions of current year 0 15,048
Reductions for tax positions of prior years (20,788) 0
Unrecognized tax benefits - end of period $ 0 $ 20,788
v3.20.4
Employee Benefit Plans - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 01, 2019
plan
Nov. 09, 2018
plan
Sep. 30, 2020
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2021
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Number of plans amended | plan 2              
Period for incremental increase of target allocation     10 months          
Workers' compensation liability, current       $ 10,355     $ 10,355 $ 11,317
Insurance receivable for worker's compensation, noncurrent       $ 48,320     48,320 52,757
Settlement             14 0
Contributions to defined contribution and profit sharing plans             3,613 22,102
Self-insured medical expense             $ 52,517 $ 64,430
Pension Plan                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Expected return on plan assets             5.90% 5.80%
Target allocation percentages       100.00%     100.00%  
Target allocation percentage, incremental increases     2.00%          
Expected contributions in next fiscal year       $ 25,541     $ 25,541  
Partial plan settlement             11,627 $ 89,433
Settlement             $ (1,636) $ (6,224)
Pension Plan | Equity Securities                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Target allocation percentages     60.00%          
Pension Plan | Debt Securities                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Target allocation percentages     40.00%          
Black lung                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Expected return on plan assets             2.00% 2.50%
Workers' compensation liability       124,260     $ 124,260 $ 136,540
Workers' compensation liability, current       10,355     10,355 11,317
Insurance receivable for worker's compensation, current       2,368     2,368 2,375
Insurance receivable for worker's compensation, noncurrent       48,320     48,320 52,757
High-deductible insurance premium expense for worker's compensation and black lung claims             7,000 10,684
Workers' compensation expense for high-deductible insurance plans             1,275 2,333
Partial plan settlement       $ 8,290       0
Settlement             (1,563) 0
Accumulated other comprehensive loss         $ 7,400   $ 163 $ 0
Alpha Companies                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Number of plans assumed | plan   3            
Alpha Companies | Pension Plan | Qualified Plan | Frozen Defined Benefit Pension Plan, Pre 2004 Balance                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Guaranteed rates of interest on accumulated balances       6.00%     6.00%  
Alpha Companies | Pension Plan | Qualified Plan | Frozen Defined Benefit Pension Plan, Post 2004 Balance                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Guaranteed rates of interest on accumulated balances       4.00%     4.00%  
Forecast | Pension Plan                
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                
Expected return on plan assets           5.80%    
v3.20.4
Employee Benefit Plans - Changes in Accumulated Benefits Obligations, Fair Value of Plan Assets and Funded Status of Plan (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Pension Plan        
Change in benefit obligation:        
Accumulated benefit obligation at beginning of period     $ 674,439 $ 675,482
Interest cost     18,730 26,564
Actuarial loss (gain)     72,822 91,287
Benefits paid     (30,916) (31,371)
Acquisition     0 1,910
Settlement     (11,627) (89,433)
Accumulated benefit obligation at end of period $ 723,448   723,448 674,439
Change in fair value of plan assets:        
Beginning balance     470,353 494,680
Actual return on plan assets     54,222 87,129
Benefits paid     (30,916) (31,371)
Settlement     (11,627) (89,433)
Employer contributions     22,745 9,348
Ending balance 504,777   504,777 470,353
Funded status (218,671)   (218,671) (204,086)
Summary of accrued benefit cost at end of period:        
Accrued benefit cost at end of period (218,671)   (218,671) (204,086)
Black lung        
Change in benefit obligation:        
Accumulated benefit obligation at beginning of period     122,788 94,805
Service cost     2,361 2,057
Interest cost     3,240 4,474
Actuarial loss (gain)     14,736 11,166
Benefits paid     (7,166) (6,543)
Acquisition     0 16,829
Curtailment gain   $ (7,400) (163) 0
Settlement (8,290)     0
Accumulated benefit obligation at end of period 127,506   127,506 122,788
Change in fair value of plan assets:        
Beginning balance     2,660 2,597
Actual return on plan assets     60 63
Benefits paid     (7,166) (6,543)
Employer contributions     7,166 6,543
Ending balance 2,720   2,720 2,660
Funded status (124,786)   (124,786) (120,128)
Summary of accrued benefit cost at end of period:        
Accrued benefit cost at end of period (124,786)   (124,786) (120,128)
Black lung | Continuing operations        
Summary of accrued benefit cost at end of period:        
Accrued benefit cost at end of period (122,961)   (122,961) (111,036)
Black lung | Discontinued Operations        
Summary of accrued benefit cost at end of period:        
Accrued benefit cost at end of period (1,825)   (1,825) (9,092)
Life insurance benefits        
Change in benefit obligation:        
Accumulated benefit obligation at beginning of period     12,341 11,368
Interest cost     337 426
Actuarial loss (gain)     420 1,002
Benefits paid     (463) (455)
Accumulated benefit obligation at end of period 12,635   12,635 12,341
Change in fair value of plan assets:        
Beginning balance     0  
Benefits paid     (463) (455)
Employer contributions     463 455
Ending balance 0   0 0
Funded status (12,635)   (12,635) (12,341)
Summary of accrued benefit cost at end of period:        
Accrued benefit cost at end of period (12,635)   (12,635) (12,341)
Life insurance benefits | Current liabilities        
Summary of accrued benefit cost at end of period:        
Accrued benefit cost at end of period (628)   (628) (719)
Life insurance benefits | Long-term liabilities        
Summary of accrued benefit cost at end of period:        
Accrued benefit cost at end of period $ (12,007)   $ (12,007) $ (11,622)
v3.20.4
Employee Benefit Plans - Gross Amounts Recognized in Accumulated Other Comprehensive (Income) Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Pension Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net actuarial gain (loss) $ 88,583 $ 46,568
Black lung    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net actuarial gain (loss) 24,042 12,980
Life insurance benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net actuarial gain (loss) $ (390) $ (872)
v3.20.4
Employee Benefit Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Pension Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Interest cost $ 18,730 $ 26,564
Expected return on plan assets (27,064) (28,042)
Amortization of net actuarial loss (gain) 2,012 797
Settlement 1,636 6,224
Net periodic benefit cost (credit) (4,686) 5,543
Black lung    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost 2,361 2,057
Interest cost 3,240 4,474
Expected return on plan assets (54) (65)
Amortization of net actuarial loss (gain) 1,942 216
Settlement 1,563 0
Net periodic benefit cost (credit) 9,052 6,682
Life insurance benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Interest cost 337 426
Amortization of net actuarial loss (gain) (48) (105)
Settlement (14) 0
Net periodic benefit cost (credit) 275 321
Continuing operations | Black lung    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net periodic benefit cost (credit) 7,670 6,394
Discontinued Operations | Black lung    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net periodic benefit cost (credit) $ 1,382 $ 288
v3.20.4
Employee Benefit Plans - Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive (Income) Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Actuarial loss (gain) $ 60,647 $ 42,891
Amortization of net actuarial loss (7,278) (7,405)
Settlement 14 0
Pension Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Actuarial loss (gain) 45,663 30,514
Amortization of net actuarial loss (2,012) (797)
Settlement (1,636) (6,224)
Total recognized in other comprehensive loss 42,015 23,493
Black lung    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Actuarial loss (gain) 14,567 11,512
Amortization of net actuarial loss (1,942) (216)
Settlement (1,563) 0
Total recognized in other comprehensive loss 11,062 11,296
Life insurance benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Actuarial loss (gain) 420 1,002
Amortization of net actuarial loss 48 105
Total recognized in other comprehensive loss $ 482 $ 1,107
v3.20.4
Employee Benefit Plans - Schedule of Plans with Benefit Obligations in Excess of Plan Assets (Details) - Pension Plan - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 723,448 $ 674,439
Accumulated benefit obligation 723,448 674,439
Fair value of plan assets $ 504,777 $ 470,353
v3.20.4
Employee Benefit Plans - Assumptions Used (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Pension Plan    
Weighted-Average Assumptions to Determine Benefit Obligations    
Discount rate 2.62% 3.36%
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost    
Discount rate for benefit obligation 3.35% 4.33%
Discount rate for interest cost 2.92% 4.01%
Expected return on plan assets 5.90% 5.80%
Black lung    
Weighted-Average Assumptions to Determine Benefit Obligations    
Discount rate 2.75% 3.47%
Federal black lung benefit trend rate 2.00% 2.00%
Black lung medical benefit trend rate 5.00% 5.00%
Black lung benefit expense inflation rate 2.00% 2.00%
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost    
Discount rate for benefit obligation 3.47% 4.36%
Discount rate for service cost 3.56% 4.54%
Discount rate for interest cost 2.61% 3.99%
Federal black lung benefit trend rate 2.50% 2.50%
Black lung medical benefit trend rate 5.00% 5.00%
Black lung benefit expense inflation rate 2.00% 2.50%
Expected return on plan assets 2.00% 2.50%
Life insurance benefits    
Weighted-Average Assumptions to Determine Benefit Obligations    
Discount rate 2.43% 3.22%
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost    
Discount rate for benefit obligation 3.22% 4.21%
Discount rate for interest cost 2.83% 3.90%
v3.20.4
Employee Benefit Plans - Allocation of Plan Assets (Details) - Pension Plan
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]  
Target Allocation Percentages 2021 100.00%
Percentage of plan assets 100.00%
Equity securities  
Defined Benefit Plan Disclosure [Line Items]  
Target Allocation Percentages 2021 60.00%
Percentage of plan assets 47.00%
Fixed income funds  
Defined Benefit Plan Disclosure [Line Items]  
Target Allocation Percentages 2021 40.00%
Percentage of plan assets 50.00%
Other  
Defined Benefit Plan Disclosure [Line Items]  
Target Allocation Percentages 2021 0.00%
Percentage of plan assets 3.00%
v3.20.4
Employee Benefit Plans - Estimated Cash Payments (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Pension Plan  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 $ 31,178
2021 31,267
2022 31,628
2023 32,149
2024 32,426
2026-2030 162,622
Estimated future cash payments 321,270
Black lung  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 6,810
2021 6,929
2022 7,038
2023 7,112
2024 7,244
2026-2030 20,004
Estimated future cash payments 55,137
Life insurance benefits  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 628
2021 588
2022 586
2023 586
2024 587
2026-2030 2,941
Estimated future cash payments $ 5,916
v3.20.4
Employee Benefit Plans - Fair Value of Plan Assets (Details) - Pension Plan - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets $ 504,777 $ 470,353 $ 494,680
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 11,454 11,155 $ 10,886
Defined Benefit Plan, Assets After Receivables For Investments Sold      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 503,370 468,809  
Receivable      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 888 1,061  
Defined Benefit Plan, Assets Before Receivables For Investments Sold | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 502,482 467,748  
Defined Benefit Plan, Assets Before Receivables For Investments Sold | Quoted Prices in Active Markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 0 0  
Defined Benefit Plan, Assets Before Receivables For Investments Sold | Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 491,028 456,593  
Defined Benefit Plan, Assets Before Receivables For Investments Sold | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 11,454 11,155  
Equity securities | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 236,405 182,782  
Equity securities | Quoted Prices in Active Markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 0 0  
Equity securities | Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 236,405 182,782  
Equity securities | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 0 0  
Fixed income funds | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 253,218 272,239  
Fixed income funds | Quoted Prices in Active Markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 0 0  
Fixed income funds | Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 253,218 272,239  
Fixed income funds | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 0 0  
Commingled short-term fund | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 1,405 1,572  
Commingled short-term fund | Quoted Prices in Active Markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 0 0  
Commingled short-term fund | Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 1,405 1,572  
Commingled short-term fund | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 0 0  
Guaranteed insurance contract | Total      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 11,454 11,155  
Guaranteed insurance contract | Quoted Prices in Active Markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 0 0  
Guaranteed insurance contract | Significant Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 0 0  
Guaranteed insurance contract | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets 11,454 11,155  
Private equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Total plan assets $ 1,407 $ 1,544  
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember  
v3.20.4
Employee Benefit Plans - Schedule of Changes in Level 3 Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Acquisition   $ 0
Pension Plan    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance $ 470,353 494,680
Ending balance 504,777 470,353
Pension Plan | Significant Unobservable Inputs (Level 3)    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance 11,155 10,886
Relating to assets still held at the reporting date 659 644
Purchases, sales and settlements (360) (375)
Ending balance $ 11,454 $ 11,155
v3.20.4
Employee Benefit Plans - Amounts Recognized in Balance Sheet (Details) - Black lung - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accrued benefit cost at end of period $ 124,786 $ 120,128
Current liabilities    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accrued benefit cost at end of period 6,784 7,409
Current liabilities - discontinued operations    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accrued benefit cost at end of period 26 63
Long-term liabilities    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accrued benefit cost at end of period 116,177 103,627
Long-term liabilities - discontinued operations    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accrued benefit cost at end of period $ 1,799 $ 9,029
v3.20.4
Stock-Based Compensation Awards - Narrative (Details)
 2 Months Ended 12 Months Ended
Nov. 09, 2018
shares
Mar. 15, 2021
shares
Dec. 31, 2020
USD ($)
award_type
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of award types | award_type     4  
Stock compensation expense | $     $ 5,540,000 $ 12,397,000
Shares repurchased, amount | $     $ 970,000 37,622,000
Time-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)     402,620  
Grant date fair value (in USD per share) | $ / shares     $ 6.17  
Shares forfeited de to plan amendment (in shares)     43,320  
Unrecognized compensation cost of non-vested shares | $     $ 1,707,000  
Unrecognized compensation cost, period for recognition     1 year 3 months 18 days  
Operational performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)     151,398  
Grant date fair value (in USD per share) | $ / shares     $ 6.36  
Shares forfeited de to plan amendment (in shares)     0  
Unrecognized compensation cost of non-vested shares | $     $ 260,000  
Unrecognized compensation cost, period for recognition     2 years 1 month 17 days  
Relative performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)     151,397  
Grant date fair value (in USD per share) | $ / shares     $ 8.53  
Shares forfeited de to plan amendment (in shares)     4,929  
Unrecognized compensation cost of non-vested shares | $     $ 1,471,000  
Unrecognized compensation cost, period for recognition     1 year 9 months  
Performance-based cash incentive awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target award amount for cash-based incentive plans | $     $ 2,755,000  
Weighted average grant date fair value, percentage of target dollar value     82.45%  
Unrecognized compensation cost of non-vested shares | $     $ 1,447,000  
Unrecognized compensation cost, period for recognition     2 years 1 month 17 days  
Absolute performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)     0  
Grant date fair value (in USD per share) | $ / shares     $ 0  
Shares forfeited de to plan amendment (in shares)     1,645  
Unrecognized compensation cost of non-vested shares | $     $ 142,000  
Unrecognized compensation cost, period for recognition     1 year 1 month 9 days  
Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)     0  
Grant date fair value (in USD per share) | $ / shares     $ 0  
Shares forfeited de to plan amendment (in shares)     0  
Unrecognized compensation cost of non-vested shares | $     $ 0  
30-Day volume-weighted average price stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost | $     0  
Exercised | $     0 6,305,000
Fixed price stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost | $     $ 0  
Exercised | $       $ 6,879,000
MIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for issuance (in shares)     1,201,202  
Number of shares available for grant (in shares)     89,780  
LTIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for issuance (in shares)     1,000,000  
Number of shares available for grant (in shares)     349,373  
LTIP | Operational and relative performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)     302,795  
Vesting period     3 years  
LTIP | Operational and relative performance-based restricted stock units | Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares forfeited de to plan amendment (in shares)   302,795    
LTIP | Operational performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)     151,398  
Closing price (in dollars per share) | $ / shares     $ 6.36  
LTIP | Relative performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)     151,397 81,065
Grant date fair value (in USD per share) | $ / shares     $ 8.53 $ 65.70
LTIP | Performance-based cash incentive awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target award amount for cash-based incentive plans | $     $ 2,755,000  
Liability for cash-based awards | $     $ 643,000  
Weighted average grant date fair value, percentage of target dollar value     82.45%  
LTIP | Absolute performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)       27,042
Grant date fair value (in USD per share) | $ / shares       $ 50.60
ANR EIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for issuance (in shares)     0  
Number of shares available for grant (in shares)     0  
Number of awards granted (in shares) 89,766      
MIP, LTIP, and ANR EIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares repurchased (in shares)     43,559 118,935
Shares repurchased, amount | $     $ 209,000 $ 5,159,000
Share repurchase price (in dollars per share) | $ / shares     $ 4.79 $ 43.37
Minimum | Operational and relative performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Potential distribution of shares, percentage     0.00%  
Minimum | LTIP | Relative performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Potential distribution of shares, percentage       0.00%
Minimum | LTIP | Performance-based cash incentive awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Potential distribution of cash-based payments, percentage     0.00%  
Minimum | LTIP | Absolute performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Potential distribution of shares, percentage       0.00%
Maximum | Operational and relative performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Potential distribution of shares, percentage     200.00%  
Maximum | LTIP | Relative performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Potential distribution of shares, percentage       400.00%
Maximum | LTIP | Performance-based cash incentive awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Potential distribution of cash-based payments, percentage     200.00%  
Maximum | LTIP | Absolute performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Potential distribution of shares, percentage       200.00%
Key Employees | Minimum | LTIP | Time-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)       79,474
Grant date fair value (in USD per share) | $ / shares       $ 49.47
Vesting period       1 year
Key Employees | Minimum | 2020 Management Incentive Plan and Long Term Incentive Plan | Time-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)     402,620  
Grant date fair value (in USD per share) | $ / shares     $ 6.17  
Key Employees | Maximum | LTIP | Time-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period       3 years
Key Employees | Maximum | 2020 Management Incentive Plan and Long Term Incentive Plan | Time-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Selling, General and Administrative Expenses        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense, percent     83.00% 76.00%
v3.20.4
Stock-Based Compensation Awards - Valuation Assumptions (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Relative performance-based restricted stock units    
Share-based Payment Award    
Start price (in USD per share) $ 7.59 $ 66.06
Stock price (in USD per share) $ 6.33 $ 61.27
Volatility 55.27% 29.98%
Risk-free interest rate 1.37% 2.42%
Expected dividend yield 0.00% 0.00%
Performance-based cash incentive awards    
Cash-based Payment Award    
Start price (in USD per share) $ 7.59  
Valuation date stock price (in USD per share) $ 6.33  
Expected volatility 55.27%  
Risk-free interest rate 1.37%  
Expected divided yield 0.00%  
Absolute performance-based restricted stock units    
Share-based Payment Award    
Stock price (in USD per share)   $ 61.27
Volatility   29.98%
Risk-free interest rate   2.42%
Expected dividend yield   0.00%
v3.20.4
Stock-Based Compensation Awards - Award Activity (Details)
 12 Months Ended
Dec. 31, 2020
$ / shares
shares
Restricted stock  
Number of  Shares  
Beginning balance (in shares) 23,598
Granted (in shares) 0
Vested (in shares) (23,598)
Forfeited or Expired (in shares) 0
Ending balance (in shares) 0
Weighted-Average Grant  Date Fair Value  
Beginning balance (in USD per share) | $ / shares $ 65.55
Granted (in USD per share) | $ / shares 0
Vested (in USD per share) | $ / shares 65.55
Forfeited or Expired (in USD per share) | $ / shares 0
Ending balance (in USD per share) | $ / shares $ 0
Time-based restricted stock units  
Number of  Shares  
Beginning balance (in shares) 158,082
Granted (in shares) 402,620
Vested (in shares) (149,829)
Forfeited or Expired (in shares) (43,320)
Ending balance (in shares) 367,553
Weighted-Average Grant  Date Fair Value  
Beginning balance (in USD per share) | $ / shares $ 64.84
Granted (in USD per share) | $ / shares 6.17
Vested (in USD per share) | $ / shares 45.22
Forfeited or Expired (in USD per share) | $ / shares 21.10
Ending balance (in USD per share) | $ / shares $ 13.72
Restricted stock units and deferred settlements  
Number of  Shares  
Vested (in shares) (33,508)
Relative performance-based restricted stock units  
Number of  Shares  
Beginning balance (in shares) 31,599
Granted (in shares) 151,397
Vested (in shares) (3,864)
Forfeited or Expired (in shares) (4,929)
Ending balance (in shares) 174,203
Weighted-Average Grant  Date Fair Value  
Beginning balance (in USD per share) | $ / shares $ 65.70
Granted (in USD per share) | $ / shares 8.53
Vested (in USD per share) | $ / shares 65.70
Forfeited or Expired (in USD per share) | $ / shares 65.70
Ending balance (in USD per share) | $ / shares $ 16.01
Relative performance-based restricted stock units, unsettled  
Number of  Shares  
Vested (in shares) (3,042)
Absolute performance-based restricted stock units  
Number of  Shares  
Beginning balance (in shares) 10,549
Granted (in shares) 0
Vested (in shares) (1,290)
Forfeited or Expired (in shares) (1,645)
Ending balance (in shares) 7,614
Weighted-Average Grant  Date Fair Value  
Beginning balance (in USD per share) | $ / shares $ 50.60
Granted (in USD per share) | $ / shares 0
Vested (in USD per share) | $ / shares 50.60
Forfeited or Expired (in USD per share) | $ / shares 50.60
Ending balance (in USD per share) | $ / shares $ 50.60
Absolute performance-based restricted stock units, unsettled  
Number of  Shares  
Vested (in shares) (1,016)
Operational performance-based restricted stock units  
Number of  Shares  
Beginning balance (in shares) 0
Granted (in shares) 151,398
Vested (in shares) 0
Forfeited or Expired (in shares) 0
Ending balance (in shares) 151,398
Weighted-Average Grant  Date Fair Value  
Beginning balance (in USD per share) | $ / shares $ 0
Granted (in USD per share) | $ / shares 6.36
Vested (in USD per share) | $ / shares 0
Forfeited or Expired (in USD per share) | $ / shares 0
Ending balance (in USD per share) | $ / shares $ 6.36
v3.20.4
Stock-Based Compensation Awards - Option Activity (Details) - 30-Day volume-weighted average price stock options - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Beginning balance, outstanding (in shares) 51,359  
Beginning balance, exercisable (in shares) 44,356  
Granted (in shares) 0  
Exercised (in shares) 0  
Forfeited or Expired (in shares) (28,134)  
Ending balance, outstanding (in shares) 23,225 51,359
Ending balance, exercisable (in shares) 23,225 44,356
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Beginning balance, outstanding (in USD per share) $ 63.45  
Beginning balance, exercisable (in USD per share) 63.03  
Granted (in USD per share) 0  
Exercised (in USD per share) 0  
Forfeited or Expired (in USD per share) 66.13  
Ending balance, outstanding (in USD per share) 60.20 $ 63.45
Ending balance, exercisable (in USD per share) $ 60.20 $ 63.03
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Outstanding 6 years 1 month 13 days 7 years 1 month 24 days
Exercisable 6 years 1 month 13 days 7 years 1 month 24 days
Aggregate Intrinsic Value    
Beginning balance, outstanding $ (2,794)  
Beginning balance, exercisable (2,394)  
Exercised 0 $ 6,305
Ending balance, outstanding (1,134) (2,794)
Ending balance, exercisable $ (1,134) $ (2,394)
v3.20.4
Stock-Based Compensation Awards - Performance-Based Cash Incentive Awards (Details) - Performance-based cash incentive awards
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Target Dollar Value  
Non-vested awards outstanding at December 31, 2019 $ 0
Granted 2,755
Vested (42)
Forfeited (507)
Non-vested awards outstanding at December 31, 2020 $ 2,206
Weighted-Average Fair Value as a % of Target Dollar Value  
Non-vested awards outstanding at December 31, 2019 0.00%
Granted 82.45%
Vested 100.00%
Forfeited 70.70%
Non-vested awards outstanding at December 31, 2020 94.21%
v3.20.4
Related Party Transactions - Narrative (Details)
$ in Thousands
Jul. 19, 2019
USD ($)
Affiliated Entity | Expenses Allocated from Alpha  
Related Party Transaction [Line Items]  
Allocated expenses $ 2,900
v3.20.4
Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Feb. 21, 2020
Feb. 20, 2020
Long-term Purchase Commitment [Line Items]        
Coal royalty expense $ 67,992 $ 91,879    
Income tax receivable 64,160      
Income tax receivable related to NOL carryback claim 5,213      
Black lung        
Long-term Purchase Commitment [Line Items]        
Collateral for black lung obligations     $ 65,700 $ 2,600
ABL Facility - due April 2022 | ABL Facility - due April 2022 | Revolving Credit Facility        
Long-term Purchase Commitment [Line Items]        
Letters of credit outstanding 123,108 $ 99,876    
ANR, Inc. and Citibank, N.A. Credit Agreement | ABL Facility - due April 2022 | Letter of Credit        
Long-term Purchase Commitment [Line Items]        
Letters of credit outstanding 14,242      
Credit and Security Agreement | ABL Facility - due April 2022 | Revolving Credit Facility        
Long-term Purchase Commitment [Line Items]        
Letters of credit outstanding 613      
Surety Bond        
Long-term Purchase Commitment [Line Items]        
Outstanding surety bonds 351,596      
Guarantor Obligations, Current Carrying Value, Discontinued Operations 134,162      
Reclamation-related obligations        
Long-term Purchase Commitment [Line Items]        
Collateral for surety bonds 56,311      
Coal purchase agreements        
Long-term Purchase Commitment [Line Items]        
Minimum quantities to be purchased, next fiscal year 44,707      
Equipment purchase agreements        
Long-term Purchase Commitment [Line Items]        
Purchase commitment, 2021 5,008      
Purchase commitment, 2023 170      
Freight and handling        
Long-term Purchase Commitment [Line Items]        
Minimum obligation, 2021 29      
Minimum obligation, 2022 338      
Royalty Obligations | Coal revenues        
Long-term Purchase Commitment [Line Items]        
Minimum obligation, 2021 15,708      
Minimum obligation, 2022 14,525      
Minimum obligation, 2023 13,633      
Minimum obligation, 2024 11,560      
Minimum obligation, 2025 10,815      
Minimum obligation, after 2025 $ 43,603      
v3.20.4
Commitments and Contingencies - Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Long-term Purchase Commitment [Line Items]    
Total restricted cash $ 105,344 $ 134,887
Less current portion (9,311) (12,363)
Restricted cash, net of current portion 96,033 122,524
Workers’ compensation and black lung obligations    
Long-term Purchase Commitment [Line Items]    
Total restricted cash 69,725 51,650
Reclamation-related obligations    
Long-term Purchase Commitment [Line Items]    
Total restricted cash 8,445 67,868
Contingent Revenue Obligation    
Long-term Purchase Commitment [Line Items]    
Total restricted cash 9,311 12,363
Less current portion (9,311) (12,363)
Financial payments and other performance obligations    
Long-term Purchase Commitment [Line Items]    
Total restricted cash $ 17,863 $ 3,006
v3.20.4
Commitments and Contingencies - Restricted Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Long-term Purchase Commitment [Line Items]    
Total restricted investments $ 23,768 $ 19,399
Restricted trading securities 22,498 11,021
Restricted held-to-maturity securities 1,270 8,378
Workers’ compensation obligations    
Long-term Purchase Commitment [Line Items]    
Total restricted investments 51 613
Reclamation-related obligations    
Long-term Purchase Commitment [Line Items]    
Total restricted investments 22,233 18,786
Financial payments and other performance obligations    
Long-term Purchase Commitment [Line Items]    
Total restricted investments $ 1,484 $ 0
v3.20.4
Commitments and Contingencies - Total Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Long-term Purchase Commitment [Line Items]    
Total deposits $ 28,247 $ 10,310
Financial payments and other performance obligations    
Long-term Purchase Commitment [Line Items]    
Total deposits 1,596 0
Reclamation-related obligations    
Long-term Purchase Commitment [Line Items]    
Total deposits 25,633 8,887
Other operating agreements    
Long-term Purchase Commitment [Line Items]    
Total deposits $ 1,018 $ 1,423
v3.20.4
Concentration of Credit Risk and Major Customer (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
assetGroup
Dec. 31, 2019
USD ($)
assetGroup
Concentration Risk [Line Items]    
Revenues | $ $ 1,416,187 $ 2,001,280
Revenues | Customer Concentration Risk    
Concentration Risk [Line Items]    
Number of customers 2 2
Revenues | Customer Concentration Risk | Top Customer    
Concentration Risk [Line Items]    
Concentration risk 16.00% 13.00%
Revenues | Customer Concentration Risk | Top 10 Customers    
Concentration Risk [Line Items]    
Concentration risk 63.00% 59.00%
Accounts Receivable | Customer Concentration Risk    
Concentration Risk [Line Items]    
Number of customers 3 3
Domestic Coal Revenue | Geographic Concentration Risk    
Concentration Risk [Line Items]    
Concentration risk 36.00% 39.00%
Export Coal Revenue | Geographic Concentration Risk    
Concentration Risk [Line Items]    
Concentration risk 64.00% 61.00%
Coal Sales Volume | Product Concentration Risk | Met coal    
Concentration Risk [Line Items]    
Concentration risk 80.00% 74.00%
Coal Sales Volume | Product Concentration Risk | Thermal Coal    
Concentration Risk [Line Items]    
Concentration risk 20.00% 26.00%
v3.20.4
Segment Information - Schedule of Operating Results and Capital Expenditures (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
segment
Dec. 31, 2020
USD ($)
segment
plant
mine
Dec. 31, 2019
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | segment 3 2  
Revenues   $ 1,416,187 $ 2,001,280
Depreciation, depletion and amortization   139,885 215,757
Amortization of acquired intangibles, net   9,214 (3,189)
Adjusted EBITDA   83,402 264,104
Capital expenditures   119,579 160,447
All Other      
Segment Reporting Information [Line Items]      
Revenues   2,654 3,534
Depreciation, depletion and amortization   (4,628) 5,439
Amortization of acquired intangibles, net   100 0
Adjusted EBITDA   (46,732) (63,883)
Capital expenditures   728 2,652
Met | Operating segments      
Segment Reporting Information [Line Items]      
Revenues   1,264,496 1,711,260
Depreciation, depletion and amortization   124,060 152,835
Amortization of acquired intangibles, net   12,889 10,389
Adjusted EBITDA   120,281 316,006
Capital expenditures   111,745 140,250
CAPP - Thermal | Operating segments      
Segment Reporting Information [Line Items]      
Revenues   149,037 286,486
Depreciation, depletion and amortization   20,453 57,483
Amortization of acquired intangibles, net   (3,775) (13,578)
Adjusted EBITDA   9,853 11,981
Capital expenditures   $ 7,106 $ 17,545
Virgina | Met      
Segment Reporting Information [Line Items]      
Number of active mines | mine   5  
Number of preparation plants | plant   2  
West Virgina | Met      
Segment Reporting Information [Line Items]      
Number of active mines | mine   17  
Number of preparation plants | plant   5  
West Virgina | CAPP - Thermal      
Segment Reporting Information [Line Items]      
Number of active mines | mine   1  
Number of preparation plants | plant   1  
v3.20.4
Segment Information - Reconciliation of Net Income (Loss) to Adjusted EBITDA (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting, Other Significant Reconciling Item [Line Items]            
Net loss from continuing operations         $ (241,470) $ (219,618)
Interest expense         74,528 67,521
Interest income         (7,027) (7,247)
Income tax benefit         (2,164) (53,287)
Depreciation, depletion and amortization         139,885 215,757
Merger-related costs         0 1,090
Non-cash stock compensation expense         4,897 12,348
Mark-to-market adjustment for acquisition-related obligations         (8,750) (3,564)
Accretion on asset retirement obligations         26,504 23,865
Loss on modification and extinguishment of debt         0 26,459
Asset Impairment and restructuring         83,878 66,324
Goodwill impairment         0 124,353
Cost impact of coal inventory fair value adjustment           8,209
Gain on assets acquired in an exchange transaction         0 (9,083)
Loss on partial settlement of benefit obligations         2,966 6,446
Amortization of acquired intangibles, net         9,214 (3,189)
Adjusted EBITDA         83,402 264,104
Impairment of long-lived assets $ 29,636 $ 219 $ 17,390 $ 33,709 80,954 60,169
Restructuring expense           6,155
Asset impairment related to write-off of prepaid purchased coal           6,155
Asset impairment           66,324
Strategic Actions with Respect to Two Thermal Coal Mining Complexes            
Segment Reporting, Other Significant Reconciling Item [Line Items]            
Management restructuring costs         26,037  
Restructuring expense 2,924       27,919  
Senior Management Changes            
Segment Reporting, Other Significant Reconciling Item [Line Items]            
Management restructuring costs         941 7,720
Met            
Segment Reporting, Other Significant Reconciling Item [Line Items]            
Impairment of long-lived assets 13,366 0 0 32,951 46,317  
CAPP - Thermal            
Segment Reporting, Other Significant Reconciling Item [Line Items]            
Impairment of long-lived assets $ 16,270 $ 219 $ 17,385 $ 758 34,632  
Operating segments | Met            
Segment Reporting, Other Significant Reconciling Item [Line Items]            
Net loss from continuing operations         (77,519) 7,944
Interest expense         (2,014) (1,209)
Interest income         (63) (100)
Income tax benefit         0 0
Depreciation, depletion and amortization         124,060 152,835
Merger-related costs           0
Non-cash stock compensation expense         289 1,494
Mark-to-market adjustment for acquisition-related obligations         0 0
Accretion on asset retirement obligations         14,214 9,599
Loss on modification and extinguishment of debt           0
Asset Impairment and restructuring         46,317  
Goodwill impairment           124,353
Cost impact of coal inventory fair value adjustment           4,751
Gain on assets acquired in an exchange transaction           (9,083)
Loss on partial settlement of benefit obligations         1,607 (1)
Amortization of acquired intangibles, net         12,889 10,389
Adjusted EBITDA         120,281 316,006
Impairment of long-lived assets           9,176
Asset impairment           15,034
Operating segments | Met | Senior Management Changes            
Segment Reporting, Other Significant Reconciling Item [Line Items]            
Management restructuring costs         501 0
Operating segments | CAPP - Thermal            
Segment Reporting, Other Significant Reconciling Item [Line Items]            
Net loss from continuing operations         (52,520) (97,398)
Interest expense         6 23
Interest income         0 0
Income tax benefit         0 0
Depreciation, depletion and amortization         20,453 57,483
Merger-related costs           0
Non-cash stock compensation expense         8 71
Mark-to-market adjustment for acquisition-related obligations         0 0
Accretion on asset retirement obligations         9,285 10,929
Loss on modification and extinguishment of debt           0
Asset Impairment and restructuring         36,719  
Goodwill impairment           0
Cost impact of coal inventory fair value adjustment           3,458
Gain on assets acquired in an exchange transaction           0
Loss on partial settlement of benefit obligations         (328) 0
Amortization of acquired intangibles, net         (3,775) (13,578)
Adjusted EBITDA         9,853 11,981
Impairment of long-lived assets           50,993
Asset impairment           50,993
Operating segments | CAPP - Thermal | Strategic Actions with Respect to Two Thermal Coal Mining Complexes            
Segment Reporting, Other Significant Reconciling Item [Line Items]            
Restructuring expense         2,087  
Operating segments | CAPP - Thermal | Senior Management Changes            
Segment Reporting, Other Significant Reconciling Item [Line Items]            
Management restructuring costs         5 0
All Other            
Segment Reporting, Other Significant Reconciling Item [Line Items]            
Net loss from continuing operations         (111,431) (130,164)
Interest expense         76,536 68,707
Interest income         (6,964) (7,147)
Income tax benefit         (2,164) (53,287)
Depreciation, depletion and amortization         (4,628) 5,439
Merger-related costs           1,090
Non-cash stock compensation expense         4,600 10,783
Mark-to-market adjustment for acquisition-related obligations         (8,750) (3,564)
Accretion on asset retirement obligations         3,005 3,337
Loss on modification and extinguishment of debt           26,459
Asset Impairment and restructuring         842  
Goodwill impairment           0
Cost impact of coal inventory fair value adjustment           0
Gain on assets acquired in an exchange transaction           0
Loss on partial settlement of benefit obligations         1,687 6,447
Amortization of acquired intangibles, net         100 0
Adjusted EBITDA         (46,732) (63,883)
Asset impairment           297
All Other | Strategic Actions with Respect to Two Thermal Coal Mining Complexes            
Segment Reporting, Other Significant Reconciling Item [Line Items]            
Restructuring expense         837  
All Other | Senior Management Changes            
Segment Reporting, Other Significant Reconciling Item [Line Items]            
Management restructuring costs         $ 435 $ 7,720
v3.20.4
Label Element Value
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations $ 212,793,000
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations us-gaap_CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations $ 139,227,000