Changes in Accumulated Other Comprehensive Income by Component

Accumulated other comprehensive income consists of unrealized gains and losses from the Company’s available-for-sale marketable securities. The following table provides a summary of the changes in accumulated other comprehensive income for the six months ended June 30, 2017 and 2016:



	Unrealized Gains and Losses on Available-for-Sale Securities⁽¹⁾
	Six Months Ended June 30,
	2017			2016
	(in thousands)
Accumulated other comprehensive income (loss) — beginning balance	$	(319	)	$	543
Other comprehensive income before reclassifications	963			1,286
Losses (gains) reclassified from other comprehensive income	118			(153		)
Net current period other comprehensive income⁽²⁾	1,081			1,133
Accumulated other comprehensive income — ending balance	$	762		$	1,676


⁽¹⁾	All amounts are net of tax.


⁽²⁾	For the six months ended June 30, 2017 and 2016, these changes in other comprehensive income were net of tax effects of $0.6 million.

Amounts reclassified from accumulated other comprehensive income (loss) represent realized gains or losses on the sale of the Company’s available-for-sale securities. Realized gains and losses are recorded pre-tax within “Other income - Investment and interest” in the Consolidated Statements of Comprehensive Income. Refer to Note 5 - Fair Value Measurements for further information. The table below shows the reclassification adjustments out of accumulated other comprehensive income (loss) for the three and six months ended June 30, 2017 and 2016:



	Amounts Reclassified from Accumulated Other Comprehensive Income
	2017			2016
	(in thousands)
Three Months Ended March 31,
Gains (losses) from the sale of available-for-sale securities	$	(48	)	$	62
Tax expense (benefit)	$	15		$	(23	)
Net amount reclassified from accumulated other comprehensive income	$	(33	)	$	39
Three Months Ended June 30,
Gains (losses) from the sale of available-for-sale securities	$	(125	)	$	181
Tax expense (benefit)	$	40		$	(67	)
Net amount reclassified from accumulated other comprehensive income	$	(85	)	$	114
Six Months Ended June 30,
Gains (losses) from the sale of available-for-sale securities	$	(173	)	$	243
Tax expense (benefit)	55			(90		)
Net amount reclassified from accumulated other comprehensive income	$	(118	)	$	153

Property and Equipment

6 Months Ended

Jun. 30, 2017

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and equipment are recorded at cost. Depreciation is recorded over the estimated useful life of each class of depreciable asset, and is computed using the straight-line method. Leasehold improvements are amortized over the shorter of the estimated asset life or term of the lease. Repairs and maintenance costs are charged to expense as incurred.

The following table sets forth the amounts of property and equipment by each class of depreciable asset as of June 30, 2017 and December 31, 2016:



	June 30, 2017		December 31, 2016
	(in thousands)
Housekeeping and Dietary equipment	$	21,783	$	21,136
Computer hardware and software	12,241		11,750
Other ⁽¹⁾	1,154		1,133
Total property and equipment, at cost	35,178		34,019
Less accumulated depreciation	21,779		20,564
Total property and equipment, net	$	13,399	$	13,455


⁽¹⁾	Includes furniture and fixtures, leasehold improvements and autos and trucks.

Depreciation expense for the three months ended June 30, 2017 and 2016 was $1.3 million respectively. Depreciation expense for the six months ended June 30, 2017 and 2016 was $2.6 million and $2.4 million, respectively.

Goodwill and Other Intangible Assets

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill And Other Intangible Assets

Goodwill and Other Intangible Assets

Goodwill

Goodwill represents the excess of the purchase price over the fair value of the net assets of an acquired business. Goodwill is not amortized, but is evaluated for impairment on an annual basis, or more frequently if impairment indicators arise.

Goodwill by reportable operating segment, as described in Note 10 - Segment Information, was approximately $42.4 million and $8.1 million for Housekeeping and Dietary, respectively, as of June 30, 2017. At December 31, 2016, goodwill by reportable operating segment was $42.3 million and $2.1 million for Housekeeping and Dietary, respectively. The increase in goodwill is related to the acquisition of certain Dietary-related assets during the second quarter 2017.

Intangible Assets

The Company’s intangible assets consist of customer relationships which were acquired through acquisitions and are recorded at their fair values at the date of acquisition. Intangible assets with determinable lives are amortized on a straight-line basis over their estimated useful lives. The customer relationships have a weighted-average amortization period of 9.9 years. As of June 30, 2017, certain customer relationship intangible assets were fully amortized and the respective balances were written off. The increase from year-end is related to the acquisition of certain Dietary-related assets during the second quarter 2017.

The following table sets forth the estimated amortization expense for intangibles subject to amortization for the remainder of 2017, the following five fiscal years and thereafter:



Period/Year	Total Amortization Expense
	(in thousands)
July 1 to December 31, 2017	$	2,143
2018	$	4,188
2019	$	3,990
2020	$	3,990
2021	$	3,990
2022	$	3,990
Thereafter	$	9,039

Amortization expense for the three months ended June 30, 2017 and 2016 was $1.1 million and $0.7 million, respectively. Amortization expense for the six months ended June 30, 2017 and 2016 was $1.7 million and $1.5 million, respectively.

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Fair Value Measurements

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

The Company’s current assets (other than marketable securities and inventories) and current liabilities are financial instruments and most of these items are recorded at cost in the Consolidated Balance Sheets. The estimated fair value of these financial instruments approximates their carrying value due to their short-term nature. The Company’s financial assets that are measured at fair value on a recurring basis are its marketable securities and deferred compensation funding. The recorded values of all of the financial instruments approximate their current fair values because of their nature, stated interest rates and respective maturity dates or durations.

The Company’s marketable securities consist of tax-exempt municipal bonds, which are classified as available-for-sale and are reported at fair value. Unrealized gains and losses associated with these investments are included in other comprehensive income (net of tax) within the Consolidated Statements of Comprehensive Income. The fair value of these marketable securities is classified within Level 2 of the fair value hierarchy, as these securities are measured using quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable. Such valuations are determined by a third-party pricing service. For each of the three months ended June 30, 2017 and 2016, the Company recorded unrealized gains on marketable securities of $0.6 million. For each of the six months ended June 30, 2017 and 2016, the Company recorded unrealized gains on marketable securities of $1.1 million.

For the three months ended June 30, 2017 and 2016, the Company received total proceeds, less the amount of interest received, of $7.0 million and $3.1 million, respectively, from sales of available-for-sale municipal bonds. For the three months ended June 30, 2017, these sales resulted in realized losses of $125 thousand which were recorded in “Other income, net – Investment and interest” in the Consolidated Statements of Comprehensive Income. The basis for the sale of these securities was the specific identification of each bond sold during the period. For the three months ended June 30, 2016, there were $181 thousand in realized gains.

For the six months ended June 30, 2017 and 2016, the Company received total proceeds, less the amount of interest received, of $14.5 million and $5.2 million, respectively, from sales of available-for-sale municipal bonds. For the six months ended June 30, 2017, these sales resulted in realized losses of $173 thousand which were recorded in “Other income, net – Investment and interest” in the Consolidated Statements of Comprehensive Income. The basis for the sale of these securities was the specific identification of each bond sold during the period. For the six months ended June 30, 2016, there were $243 thousand in realized gains.

The investments under the funded deferred compensation plan are accounted for as trading securities and unrealized gains or losses are included in earnings. The fair value of these investments are determined based on quoted market prices (Level 1).

The following tables provide fair value measurement information for our marketable securities and deferred compensation fund investments as of June 30, 2017 and December 31, 2016:



	As of June 30, 2017
					Fair Value Measurement Using:
	Carrying Amount		Total Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(in thousands)
Financial Assets:
Marketable securities
Municipal bonds — available-for-sale	$	70,082	$	70,082	$	—	$	70,082	$	—

Deferred compensation fund
Money Market⁽¹⁾	$	2,362	$	2,362	$	—	$	2,362	$	—
Balanced and Lifestyle	7,897		7,897		7,897		—		—
Large Cap Growth	6,852		6,852		6,852		—		—
Small Cap Growth	3,189		3,189		3,189		—		—
Fixed Income	3,009		3,009		3,009		—		—
International	1,379		1,379		1,379		—		—
Mid Cap Growth	1,638		1,638		1,638		—		—
Deferred compensation fund	$	26,326	$	26,326	$	23,964	$	2,362	$	—



	As of December 31, 2016
					Fair Value Measurement Using:
	Carrying Amount		Total Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(in thousands)
Financial Assets:
Marketable securities
Municipal bonds — available-for-sale	$	67,730	$	67,730	$	—	$	67,730	$	—

Deferred compensation fund
Money Market ⁽¹⁾	$	3,147	$	3,147	$	—	$	3,147	$	—
Balanced and Lifestyle	7,162		7,162		7,162		—		—
Large Cap Growth	5,583		5,583		5,583		—		—
Small Cap Growth	2,933		2,933		2,933		—		—
Fixed Income	2,752		2,752		2,752		—		—
International	1,132		1,132		1,132		—		—
Mid Cap Growth	1,410		1,410		1,410		—		—
Deferred compensation fund	$	24,119	$	24,119	$	20,972	$	3,147	$	—

⁽¹⁾

The fair value of the money market fund is based on the net asset value (“NAV”) of the shares held by the plan at the end of the period. The money market fund includes short-term United States dollar denominated money market instruments and the NAV is determined by the custodian of the fund. The money market fund can be redeemed at its NAV at the measurement date as there are no significant restrictions on the ability to sell this investment.



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value		Other-than-temporary Impairments
	(in thousands)
June 30, 2017
Type of security:
Municipal bonds — available-for-sale	$	68,910	$	1,258	$	(86	)	$	70,082	$	—
Total debt securities	$	68,910	$	1,258	$	(86	)	$	70,082	$	—

December 31, 2016
Type of security:
Municipal bonds — available-for-sale	$	68,220	$	178	$	(668	)	$	67,730	$	—
Total debt securities	$	68,220	$	178	$	(668	)	$	67,730	$	—

The following table summarizes the contractual maturities of debt securities held at June 30, 2017 and December 31, 2016, which are classified as marketable securities in the Consolidated Balance Sheets:



	Municipal Bonds — Available-for-Sale
Contractual maturity:	June 30, 2017		December 31, 2016
	(in thousands)
Maturing in one year or less	$	960	$	973
Maturing in second year through fifth year	18,260		28,671
Maturing in sixth year through tenth year	22,980		21,651
Maturing after ten years	27,882		16,435
Total debt securities	$	70,082	$	67,730

Share-Based Compensation

6 Months Ended

Jun. 30, 2017

Share-Based Compensation

A summary of stock-based compensation expense for the six months ended June 30, 2017 and 2016 is as follows:



	Six Months Ended June 30,
	2017		2016
	(in thousands)
Stock options	$	2,040	$	1,605
Restricted stock and restricted stock units	584		273
Employee Stock Purchase Plan	249		213
Total pre-tax stock-based compensation expense charged against income ⁽¹⁾	$	2,873	$	2,091


⁽¹⁾	Stock-based compensation expense is recorded in selling, general and administrative expense in our Consolidated Statements of Comprehensive Income.

At June 30, 2017, the unrecognized compensation cost related to unvested stock options and awards was $13.7 million. The weighted average period over which these awards will vest is approximately 3.2 years.

2012 Equity Incentive Plan

The Company’s 2012 Equity Incentive Plan (the “Plan”) provides that current or prospective officers, employees, non-employee directors and advisors can receive share-based awards such as stock options, restricted stock, restricted stock units and other stock awards. The Plan seeks to promote the highest level of performance by providing an economic interest in the long-term success of the Company.

As of June 30, 2017, 3.6 million shares of common stock were reserved for issuance under the Plan, including 0.7 million shares available for future grant. No stock award will have a term in excess of ten years. All awards granted under the Plan become vested and exercisable ratably over a five year period on each yearly anniversary of the grant date.

The Nominating, Compensation and Stock Option Committee of the Board of Directors is responsible for determining the terms of the grants in accordance with the Plan.

Stock Options

A summary of stock options outstanding under the Plan as of December 31, 2016 and changes during the six months ended June 30, 2017 is as follows:



	Stock Options Outstanding
	Number of Shares		Weighted Average Exercise Price
	(in thousands)
December 31, 2016	2,615		$	24.61
Granted	544		$	39.38
Canceled	(61	)	$	33.96
Exercised	(334	)	$	22.14
June 30, 2017	2,764		$	27.61

The weighted average grant-date fair value of stock options granted during the six months ended June 30, 2017 and 2016 was $8.52 and $7.46 per common share, respectively. The total intrinsic value of options exercised during the six months ended June 30, 2017 and 2016 was $7.0 million and $3.9 million, respectively.

The fair value of stock option awards granted in 2017 and 2016 was estimated on the date of grant using the Black-Scholes option valuation model using the following assumptions:



	Six Months Ended
	2017		2016
Risk-free interest rate	2.0	%	2.0	%
Weighted average expected life (years)	5.8 years		5.8 years
Expected volatility	25.1	%	26.0	%
Dividend yield	1.9	%	2.0	%

The following table summarizes other information about the stock options at June 30, 2017:



	June 30, 2017
	(in thousands, except per share data)
Outstanding:
Aggregate intrinsic value	$	53,140
Weighted average remaining contractual life (years)	6.5 years
Exercisable:
Number of options	1,305
Weighted average exercise price	$	20.51
Aggregate intrinsic value	$	34,338
Weighted average remaining contractual life (years)	4.5 years

Restricted Stock

During the six months ended June 30, 2017, the Company did not grant any restricted stock. During the six months ended June 30, 2016, the Company granted 44 thousand shares of restricted stock with a weighted average grant date fair value of $34.14 per share. Fair value is determined based on the market price of the shares on the date of grant.

A summary of the outstanding restricted stock awards as of December 31, 2016 and changes during the six months ended June 30, 2017 is as follows:



	Shares		Weighted Average Grant Date Fair Value
	(in thousands)
December 31, 2016	74		$	32.09
Granted	—		$	—
Vested	(18	)	$	31.41
Forfeited	—		$	—
June 30, 2017	56		$	32.30

Restricted Stock Units

During the six months ended June 30, 2017, the Company granted 81 thousand restricted stock units with a weighted average grant date fair value of $39.38 per unit. Fair value is determined based on the market price of the underlying shares on the date of grant. During the six months ended June 30, 2016, there were no grants of restricted stock units.

A summary of the outstanding restricted stock units as of December 31, 2016 and changes during the six months ended June 30, 2017 is as follows:



	Units	Weighted Average Grant Date Fair Value
	(in thousands)
December 31, 2016	—	$	—
Granted	81	$	39.38
Vested	—	$	—
Forfeited	—	$	—
June 30, 2017	81	$	39.38

Employee Stock Purchase Plan

The Company's Employee Stock Purchase Plan ("ESPP") is currently available through 2021 to all eligible employees. All full-time and certain part-time employees who have completed two years of continuous service with us are eligible to participate. Annual offerings commence and terminate on the respective year’s first and last calendar day.

Under the ESPP, the Company is authorized to issue up to 4.1 million shares of its common stock to our employees. Pursuant to such authorization, there are 2.3 million shares available for future grant at June 30, 2017.

The stock-based compensation expense associated with the options granted under the ESPP during the six months ended June 30, 2017 and 2016 was estimated on the date of grant using the Black-Scholes option valuation model using the following assumptions:



	Six Months Ended June 30,
	2017	2016
Risk-free interest rate	1.05%	0.58%
Weighted average expected life (years)	1.0	1.0
Expected volatility	21.2%	19.7%
Dividend yield	1.9%	2.0%

Deferred Compensation Plan

The Company offers a Supplemental Executive Retirement Plan (“SERP”) for certain key executives and employees. The SERP allows participants to defer a portion of their earned income on a pre-tax basis and as of the last day of each plan year, each participant will be credited with a match of a portion of their deferral in the form of the Company’s Common Stock based on the then-current market value. Under the SERP, the Company is authorized to issue 1.0 million shares of its common stock to its employees. Pursuant to such authorization, the Company has 0.4 million shares available for future grant at June 30, 2017. At the time of issuance, such shares are accounted for at cost as treasury stock.

The following table summarizes information about the SERP during the six months ended June 30, 2017 and 2016:



	Six Months Ended June 30,
	2017		2016
	(in thousands)
SERP expense⁽¹⁾	$	308	$	309
Unrealized gain recorded in SERP liability account	$	2,313	$	218

⁽¹⁾ Both the SERP match and the deferrals are included in the selling, general and administrative caption in the consolidated statements of comprehensive income.

Dividends

6 Months Ended

Jun. 30, 2017

Earnings Per Common Share

Dividends

During the six months ended June 30, 2017, the Company paid regular quarterly cash dividends totaling approximately $27.4 million as follows:



	Quarter Ended
	March 31, 2017		June 30, 2017
	(in thousands, except per share amounts)
Cash dividends paid per common share	$	0.18625	$	0.18750
Total cash dividends paid	$	13,624	$	13,750
Record date	February 17, 2017		May 19, 2017
Payment date	March 24, 2017		June 23, 2017

Additionally, on July 11, 2017, the Company’s Board of Directors declared a regular quarterly cash dividend of $0.18875 per common share, which will be paid on September 22, 2017, to shareholders of record as of the close of business on August 18, 2017.

Cash dividends declared on the outstanding weighted average number of basic common shares for the periods presented were as follows:



	Three Months Ended June 30,				Six Months Ended June 30, 2017
	2017		2016		2017		2016
Cash dividends declared per common share	$	0.18875	$	0.18375	$	0.37625	$	0.36625

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The 2017 estimated annual effective tax rate is expected to be approximately 33.7%. Due to the adoption of ASU 2016-09, the tax effects of option exercises or vested awards should be treated as discrete items in the reporting period in which they occur, and therefore cannot be considered in the calculation of the estimated annual effective tax rate. Excluding the impact of ASU 2016-09, the estimated annual effective tax rate would be 35.7%. Differences between the effective tax rate and the applicable U.S. federal statutory rate arise primarily from the effect of state and local income taxes, share-based compensation and tax credits available to the Company. The actual 2017 effective tax rate will likely vary from the estimate depending on the availability of tax credits and the exercises of stock options and vesting of share-based awards. The Company accounts for income taxes using the asset and liability method, which results in recognizing income tax expense based on the amount of income taxes payable or refundable for the current year. Additionally, the Company regularly evaluates the tax positions taken or expected to be taken resulting from financial statement recognition of certain items. Based on the evaluation, there are no significant uncertain tax positions requiring recognition in the Company’s financial statements. The evaluation was performed for the tax years ended December 31, 2013 through 2016 (with regard to U.S. federal income tax returns) and December 31, 2012 through 2016 (with regard to various state and local income tax returns), the tax years which remain subject to examination by major tax jurisdictions as of June 30, 2017. The Company may from time to time be assessed interest or penalties by taxing jurisdictions, although any such assessments historically have been minimal and immaterial to its financial results. When the Company has received an assessment for interest and/or penalties, it will be classified in the financial statements as selling, general and administrative expense. In addition, any interest or penalties relating to recognized uncertain tax positions would also be recorded in selling, general and administrative expense.

Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions A director is a member of a law firm retained by the Company. In each of the six months ended June 30, 2017 and 2016, fees paid to such firm by the Company did not exceed $120,000. Additionally, such fees did not exceed, in either period, 5% of such firm’s or the Company’s revenues.

Segment Information

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Segment Information

The Company manages and evaluates its operations in two reportable segments: Housekeeping (housekeeping, laundry, linen and other services) and Dietary (dietary department services). Although both segments serve the same client base and share many operational similarities, they are managed separately due to distinct differences in the type of services provided, as well as the specialized expertise required of the professional management personnel responsible for delivering each segment’s services. Such services are rendered pursuant to discrete service agreements, specific to each reportable segment.

The Company’s accounting policies for the segments are generally the same as described in the Company’s significant accounting policies. Differences between the reportable segments’ operating results and other disclosed data and the information in the consolidated financial statements relate primarily to corporate level transactions and recording of transactions at the reportable segment level which use methods other than generally accepted accounting principles. There are certain inventories and supplies that are primarily expensed when incurred within the operating segments, while they are capitalized in the consolidated financial statements. In addition, most corporate expenses such as corporate salary and benefit costs, certain legal costs, information technology costs, depreciation, amortization of finite-lived intangible assets, share based compensation costs and other corporate-specific costs, are not allocated to the operating segments. Additionally, there are allocations for workers’ compensation and general liability expense within the operating segments that differ from our actual expense recorded for U.S. GAAP. Segment amounts disclosed are prior to any elimination entries made in consolidation.



	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	(in thousands)
Revenues
Housekeeping	$	242,919		$	238,291		$	486,342		$	476,570
Dietary	227,957			148,265			389,024			294,793
Total	$	470,876		$	386,556		$	875,366		$	771,363

Income before income taxes
Housekeeping	$	21,474		$	22,821		$	44,676		$	45,321
Dietary	13,142			9,071			23,367			18,219
Corporate and eliminations ⁽¹⁾	(1,538		)	(2,209		)	(2,686		)	(4,253		)
Total	$	33,078		$	29,683		$	65,357		$	59,287

⁽¹⁾

Primarily represents corporate office costs and related overhead, recording of certain inventories and supplies and workers compensation costs at the reportable segment level which use accounting methods that differ from those used at the corporate level, as well as consolidated subsidiaries’ operating expenses that are not allocated to the reportable segments, net of investment and interest income.

Earnings Per Common Share

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Basic and diluted earnings per common share are computed by dividing net income by the weighted-average number of basic and diluted common shares outstanding, respectively. The weighted-average number of diluted common shares includes the impact of dilutive securities, including outstanding stock options and unvested restricted stock and restricted stock units. The table below reconciles the weighted-average basic and diluted common shares outstanding:



	Three Months Ended June 30,		Six Months Ended June 30,
	2017	2016	2017	2016
	(in thousands)
Weighted average number of common shares outstanding - basic	73,276	72,568	73,176	72,466
Effect of dilutive securities⁽¹⁾	993	748	932	699
Weighted average number of common shares outstanding - diluted	74,269	73,316	74,108	73,165

⁽¹⁾

Certain outstanding stock option awards are anti-dilutive and were therefore excluded from the calculation of the weighted average number of diluted common shares outstanding. During the three and six months ended June 30, 2017, options to purchase 0.5 million shares having a weighted average exercise price of $39.38 per share were excluded. During the three and six months ended June 30, 2016, options to purchase 0.6 million shares having a weighted average exercise price of $34.14 per share were excluded.

Other Contingencies	6 Months Ended
Other Contingencies	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Other Contingencies	Other Contingencies Line of Credit At June 30, 2017 the Company had a $200 million bank line of credit on which to draw for general corporate purposes. Amounts drawn under the line of credit are payable upon demand and at June 30, 2017, there were $16.2 million in borrowings under the line of credit. The line of credit requires the Company to satisfy one financial covenant, with which the Company is in compliance as of June 30, 2017 and expects to remain in compliance. The line of credit expires on December 18, 2018. At June 30, 2017, the Company also had outstanding $70.7 million in irrevocable standby letters of credit, which relate to payment obligations under the Company's insurance programs. In connection with the issuance of the letters of credit, the amount available under the line of credit was reduced by $70.7 million to $129.3 million at June 30, 2017. The letters of credit were increased to $74.2 million on July 3, 2017, which resulted in a corresponding decrease of the amount available under the line of credit to $125.8 million. Tax Jurisdictions and Matters The Company provides services throughout the continental United States and is subject to numerous state and local taxing jurisdictions. In the ordinary course of business, a jurisdiction may contest our reporting positions with respect to the application of its tax code to our services. A jurisdiction’s conflicting position on the taxability of our services could result in additional tax liabilities. The Company has tax matters with various taxing authorities. Because of the uncertainties related to both the probable outcomes and amount of probable assessments due, the Company is unable to make a reasonable estimate of a liability. The company does not expect the resolution of any of these matters, taken individually or in the aggregate, to have a material adverse effect on the consolidated financial position or results of operations based on the Company’s best estimate of the outcomes of such matters. Legal Proceedings The Company is subject to various claims and legal actions in the ordinary course of business. Some of these matters include payroll and employee-related matters and examinations by governmental agencies. As the Company becomes aware of such claims and legal actions, the Company records accruals for any exposures that are probable and estimable. If adverse outcomes of such claims and legal actions are reasonably possible, Management assesses materiality and provides financial disclosure, as appropriate. The Company believes it is not a party to, nor are any of its properties the subject of, any pending legal proceeding or governmental examination that would have a material adverse effect on the Company’s consolidated financial condition or liquidity. Government Regulations The Company’s clients are concentrated in the health care industry and are primarily providers of long-term care. The revenues of many of our clients are highly reliant on Medicare, Medicaid and third party payors’ reimbursement funding rates. New legislation or additional changes in existing regulations could directly impact the governmental reimbursement programs in which the clients participate. As a result, the Company may not realize the full effects of such programs until these laws are fully implemented and government agencies issue applicable regulations or guidance.

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 11, 2017, the Company entered into an Amended and Restated Committed Line of Credit Note to increase the existing bank line and letter of credit availability to $300 million. There were no other changes to the terms of the line of credit and amounts drawn under the line of credit remain payable upon demand. The proceeds available under the facility will be used for general corporate purposes. The Company evaluated all other subsequent events through the filing date of this Form 10-Q. There were no other events or transactions occurring during this subsequent reporting period which require recognition or additional disclosure in these financial statements.

Description of Business and Significant Accounting Policies (Policy)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Nature of Operations	Healthcare Services Group, Inc. (the “Company”) provides management, administrative and operating expertise and services to the housekeeping, laundry, linen, facility maintenance and dietary service departments of the health care industry, including nursing homes, retirement complexes, rehabilitation centers and hospitals located throughout the United States. Although the Company does not directly participate in any government reimbursement programs, the Company’s clients receive government reimbursements related to Medicare and Medicaid. Therefore, they are directly affected by any legislation relating to Medicare and Medicaid reimbursement programs. The Company provides services primarily pursuant to full service agreements with our clients. In such agreements, the Company is responsible for the day-to-day management of employees located at the clients’ facilities. The Company also provides services on the basis of management-only agreements for a limited number of clients. The agreements with clients typically provide for renewable one year service terms, cancelable by either party upon 30 to 90 days’ notice after the initial 60 to 120 day period. The Company is organized into two reportable segments: housekeeping, laundry, linen and other services (“Housekeeping”), and dietary department services (“Dietary”). Housekeeping consists of managing the clients’ housekeeping departments, which are principally responsible for the cleaning, disinfecting and sanitizing of resident rooms and common areas of a client’s facility, as well as the laundering and processing of the bed linens, uniforms, resident personal clothing and other assorted linen items utilized at a client facility. Dietary consists of managing the clients’ dietary departments which are principally responsible for food purchasing, meal preparation and dietitian professional services, which includes the development of menus that meets residents’ dietary needs.
Unaudited Interim Financial Data	The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”) for interim financial information and the requirements of Form 10-Q and Article 10 of Regulation S-X. Accordingly, these consolidated financial statements do not include all of the information and footnotes necessary for a complete presentation of financial position, results of operations and cash flows. However, in our opinion, all adjustments which are of a normal recurring nature and are necessary for a fair presentation have been reflected in these consolidated financial statements. The balance sheet shown in this report as of December 31, 2016 has been derived from, and does not include, all of the disclosures contained in the financial statements for the year ended December 31, 2016. These financial statements should be read in conjunction with the financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. The results of operations for the three and six months ended June 30, 2017 are not necessarily indicative of the results that may be expected for any future period. Certain amounts in the prior year financial statements have been reclassified to conform to current presentation.
Principles of Consolidation	The accompanying consolidated financial statements include the accounts of Healthcare Services Group, Inc. and its wholly-owned subsidiaries. All significant intercompany transactions and balances have been eliminated in consolidation.
Cash and Cash Equivalents	Cash and cash equivalents are held in U.S. financial institutions or in custodial accounts with U.S. financial institutions. Cash equivalents are defined as short-term, highly liquid investments with a maturity of three months or less at the time of purchase, that are readily convertible into cash and have insignificant interest rate risk.
Inventories and Supplies	Inventories and supplies include housekeeping, linen and laundry supplies, as well as food provisions and supplies. Inventories and supplies are stated at cost to approximate a first-in, first-out (FIFO) basis. Linen supplies are amortized on a straight-line basis over their estimated useful life of 24 months.
Revenue Recognition	Revenues from our service agreements with clients are recognized as services are performed. Revenues are reported net of sales taxes that are collected from customers and remitted to taxing authorities.
Income Taxes	The Company uses the asset and liability method of accounting for income taxes. Under this method, income tax expense is recognized for the amount of taxes payable or refundable for the current period. The Company accrues for probable tax obligations as required by facts and circumstances in various regulatory environments. In addition, deferred tax assets and liabilities are recognized for expected future tax consequences of temporary differences between the financial reporting and tax bases of assets and liabilities. When appropriate, valuation allowances are recorded to reduce deferred tax assets to amounts for which realization is more likely than not. Uncertain income tax positions taken or expected to be taken in tax returns are reflected within the Company’s financial statements based on a recognition and measurement process.
Earnings per Common Share	Basic earnings per common share is computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted earnings per common share is calculated using the weighted-average number of common shares outstanding and dilutive common shares, such as those issuable upon exercise of stock options and upon the vesting of restricted stock and restricted stock units.
Share-Based Compensation	The Company estimates the fair value of share-based awards on the date of grant using the Black-Scholes valuation model for stock options and using the share price on the date of grant for restricted stock and restricted stock units. The value of the award is recognized ratably as an expense in the Company’s Consolidated Statements of Comprehensive Income over the requisite service periods, with adjustments made for forfeitures as they occur.
Use of Estimates in Financial Statements	In preparing financial statements in conformity with U.S. GAAP, estimates and assumptions are made that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities, and the reported amounts of revenues and expenses. Actual results could differ from those estimates. Significant estimates are used in determining, but are not limited to, the Company’s allowance for doubtful accounts, accrued insurance claims, valuations, deferred taxes and reviews for potential impairment. The estimates are based upon various factors including current and historical trends, as well as other pertinent industry and regulatory authority information. Management regularly evaluates this information to determine if it is necessary to update the basis for its estimates and to adjust for known changes.
Concentrations of Credit Risk	The financial instruments that are subject to concentrations of credit risk are cash and cash equivalents, marketable securities, deferred compensation funding and accounts and notes receivable. The Company’s marketable securities are fixed income investments which are highly liquid and can be readily purchased or sold through established markets. At June 30, 2017 and December 31, 2016, substantially all of the Company’s cash and cash equivalents and marketable securities were held in one large financial institution located in the United States. The Company’s clients are concentrated in the health care industry and are primarily providers of long-term care. The revenues of many of our clients are highly reliant on Medicare, Medicaid and third party payors’ reimbursement funding rates. New legislation or changes in existing regulations could be made which could directly impact the governmental reimbursement programs in which the clients participate. As a result, the full effect of such programs may not be realized until these laws are fully implemented and governmental agencies issue applicable regulations or guidance.
Recent Accounting Pronouncements	In March 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-09, Stock Compensation: Improvements to Employee Share-Based Payment Accounting. ASU 2016-09 is intended to simplify several aspects of the accounting for share-based payments. The Company adopted the standard beginning January 1, 2017. The impact of adopting the standard includes the recognition of excess tax benefits related to share-based payments as a component of income tax expense, as opposed to additional paid-in capital; an amendment to the calculation of diluted earnings per share to exclude windfall tax benefits from assumed proceeds when calculating diluted shares outstanding; as well as accounting for forfeitures of share-based awards as they occur, as opposed to reserving for estimated forfeitures. In January 2017, the FASB issued ASU 2017-01, Business Combinations: Clarifying the Definition of a Business. The guidance changes the definition of a business to assist entities in evaluating whether a set of transferred assets and activities constitutes a business under Topic 805. The guidance is effective for annual periods beginning after December 15, 2017, with early adoption permitted. The Company plans to adopt the standard effective January 1, 2018. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, which was subsequently amended and updated throughout 2015 and 2016. The standard provides guidance on revenue recognition, among other topics such as the accounting for compensation and costs to obtain a contract. The standard requires that an entity recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Adoption is required for reporting periods beginning after December 15, 2017, with early adoption prohibited. The Company plans to adopt the standard beginning on January 1, 2018. The Company is in the process of evaluating the impact of the adoption of this ASU, as well as determining the transition method that will be applied. Management’s analysis has consisted of reviewing the nature and terms of existing contracts under the provisions of the new guidance and assessing any operational changes and process updates required for compliance. Currently, Management does not expect a material impact to the Company's accounting for the revenue earned related to its Housekeeping and Dietary department services. Management anticipates that the most significant impact of the new standard will relate to additional disclosure obligations. In February 2016, the FASB issued ASU 2016-02, Leases. ASU 2016-02 requires lessees to recognize assets and liabilities on their balance sheet related to the rights and obligations created by most leases, while continuing to recognize expenses on their income statements over the lease term. It will also require disclosures designed to give financial statement users information regarding the amount, timing, and uncertainty of cash flows arising from leases. The guidance is effective for annual reporting periods beginning after December 15, 2018, and interim periods within those years. Early adoption is permitted for all entities. The Company will adopt the new guidance as of January 1, 2019. Management is continuing to evaluate the expected impact of the requirements, however it is expected that the primary impact will relate to the capitalization of operating leases of office space, vehicles and equipment.
Reportable Operating Segments	The Company’s accounting policies for the segments are generally the same as described in the Company’s significant accounting policies. Differences between the reportable segments’ operating results and other disclosed data and the information in the consolidated financial statements relate primarily to corporate level transactions and recording of transactions at the reportable segment level which use methods other than generally accepted accounting principles. There are certain inventories and supplies that are primarily expensed when incurred within the operating segments, while they are capitalized in the consolidated financial statements. In addition, most corporate expenses such as corporate salary and benefit costs, certain legal costs, information technology costs, depreciation, amortization of finite-lived intangible assets, share based compensation costs and other corporate-specific costs, are not allocated to the operating segments. Additionally, there are allocations for workers’ compensation and general liability expense within the operating segments that differ from our actual expense recorded for U.S. GAAP. Segment amounts disclosed are prior to any elimination entries made in consolidation.

Changes in Accumulated Other Comprehensive Income by Component (Tables)

6 Months Ended

Jun. 30, 2017

Schedule of Accumulated Other Comprehensive Income

The following table provides a summary of the changes in accumulated other comprehensive income for the six months ended June 30, 2017 and 2016:



	Unrealized Gains and Losses on Available-for-Sale Securities⁽¹⁾
	Six Months Ended June 30,
	2017			2016
	(in thousands)
Accumulated other comprehensive income (loss) — beginning balance	$	(319	)	$	543
Other comprehensive income before reclassifications	963			1,286
Losses (gains) reclassified from other comprehensive income	118			(153		)
Net current period other comprehensive income⁽²⁾	1,081			1,133
Accumulated other comprehensive income — ending balance	$	762		$	1,676


⁽¹⁾	All amounts are net of tax.


⁽²⁾	For the six months ended June 30, 2017 and 2016, these changes in other comprehensive income were net of tax effects of $0.6 million.

Reclassification out of Accumulated Other Comprehensive Income

The table below shows the reclassification adjustments out of accumulated other comprehensive income (loss) for the three and six months ended June 30, 2017 and 2016:



	Amounts Reclassified from Accumulated Other Comprehensive Income
	2017			2016
	(in thousands)
Three Months Ended March 31,
Gains (losses) from the sale of available-for-sale securities	$	(48	)	$	62
Tax expense (benefit)	$	15		$	(23	)
Net amount reclassified from accumulated other comprehensive income	$	(33	)	$	39
Three Months Ended June 30,
Gains (losses) from the sale of available-for-sale securities	$	(125	)	$	181
Tax expense (benefit)	$	40		$	(67	)
Net amount reclassified from accumulated other comprehensive income	$	(85	)	$	114
Six Months Ended June 30,
Gains (losses) from the sale of available-for-sale securities	$	(173	)	$	243
Tax expense (benefit)	55			(90		)
Net amount reclassified from accumulated other comprehensive income	$	(118	)	$	153

Property and Equipment (Tables)

6 Months Ended

Jun. 30, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

The following table sets forth the amounts of property and equipment by each class of depreciable asset as of June 30, 2017 and December 31, 2016:



	June 30, 2017		December 31, 2016
	(in thousands)
Housekeeping and Dietary equipment	$	21,783	$	21,136
Computer hardware and software	12,241		11,750
Other ⁽¹⁾	1,154		1,133
Total property and equipment, at cost	35,178		34,019
Less accumulated depreciation	21,779		20,564
Total property and equipment, net	$	13,399	$	13,455


⁽¹⁾	Includes furniture and fixtures, leasehold improvements and autos and trucks.

Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Estimated Amortization Expense For Intangibles Subject To Amortization

The following table sets forth the estimated amortization expense for intangibles subject to amortization for the remainder of 2017, the following five fiscal years and thereafter:



Period/Year	Total Amortization Expense
	(in thousands)
July 1 to December 31, 2017	$	2,143
2018	$	4,188
2019	$	3,990
2020	$	3,990
2021	$	3,990
2022	$	3,990
Thereafter	$	9,039

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

The following tables provide fair value measurement information for our marketable securities and deferred compensation fund investments as of June 30, 2017 and December 31, 2016:



	As of June 30, 2017
					Fair Value Measurement Using:
	Carrying Amount		Total Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(in thousands)
Financial Assets:
Marketable securities
Municipal bonds — available-for-sale	$	70,082	$	70,082	$	—	$	70,082	$	—

Deferred compensation fund
Money Market⁽¹⁾	$	2,362	$	2,362	$	—	$	2,362	$	—
Balanced and Lifestyle	7,897		7,897		7,897		—		—
Large Cap Growth	6,852		6,852		6,852		—		—
Small Cap Growth	3,189		3,189		3,189		—		—
Fixed Income	3,009		3,009		3,009		—		—
International	1,379		1,379		1,379		—		—
Mid Cap Growth	1,638		1,638		1,638		—		—
Deferred compensation fund	$	26,326	$	26,326	$	23,964	$	2,362	$	—



	As of December 31, 2016
					Fair Value Measurement Using:
	Carrying Amount		Total Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(in thousands)
Financial Assets:
Marketable securities
Municipal bonds — available-for-sale	$	67,730	$	67,730	$	—	$	67,730	$	—

Deferred compensation fund
Money Market ⁽¹⁾	$	3,147	$	3,147	$	—	$	3,147	$	—
Balanced and Lifestyle	7,162		7,162		7,162		—		—
Large Cap Growth	5,583		5,583		5,583		—		—
Small Cap Growth	2,933		2,933		2,933		—		—
Fixed Income	2,752		2,752		2,752		—		—
International	1,132		1,132		1,132		—		—
Mid Cap Growth	1,410		1,410		1,410		—		—
Deferred compensation fund	$	24,119	$	24,119	$	20,972	$	3,147	$	—

⁽¹⁾

The fair value of the money market fund is based on the net asset value (“NAV”) of the shares held by the plan at the end of the period. The money market fund includes short-term United States dollar denominated money market instruments and the NAV is determined by the custodian of the fund. The money market fund can be redeemed at its NAV at the measurement date as there are no significant restrictions on the ability to sell this investment.

Marketable Debt Securities



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value		Other-than-temporary Impairments
	(in thousands)
June 30, 2017
Type of security:
Municipal bonds — available-for-sale	$	68,910	$	1,258	$	(86	)	$	70,082	$	—
Total debt securities	$	68,910	$	1,258	$	(86	)	$	70,082	$	—

December 31, 2016
Type of security:
Municipal bonds — available-for-sale	$	68,220	$	178	$	(668	)	$	67,730	$	—
Total debt securities	$	68,220	$	178	$	(668	)	$	67,730	$	—

Contractual Maturities of Available for Sale Investments

The following table summarizes the contractual maturities of debt securities held at June 30, 2017 and December 31, 2016, which are classified as marketable securities in the Consolidated Balance Sheets:



	Municipal Bonds — Available-for-Sale
Contractual maturity:	June 30, 2017		December 31, 2016
	(in thousands)
Maturing in one year or less	$	960	$	973
Maturing in second year through fifth year	18,260		28,671
Maturing in sixth year through tenth year	22,980		21,651
Maturing after ten years	27,882		16,435
Total debt securities	$	70,082	$	67,730

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2017

Schedule of Stock-based Compensation Expense

A summary of stock-based compensation expense for the six months ended June 30, 2017 and 2016 is as follows:



	Six Months Ended June 30,
	2017		2016
	(in thousands)
Stock options	$	2,040	$	1,605
Restricted stock and restricted stock units	584		273
Employee Stock Purchase Plan	249		213
Total pre-tax stock-based compensation expense charged against income ⁽¹⁾	$	2,873	$	2,091


⁽¹⁾	Stock-based compensation expense is recorded in selling, general and administrative expense in our Consolidated Statements of Comprehensive Income.

Summary of Other Information of Stock Option Plans

A summary of stock options outstanding under the Plan as of December 31, 2016 and changes during the six months ended June 30, 2017 is as follows:



	Stock Options Outstanding
	Number of Shares		Weighted Average Exercise Price
	(in thousands)
December 31, 2016	2,615		$	24.61
Granted	544		$	39.38
Canceled	(61	)	$	33.96
Exercised	(334	)	$	22.14
June 30, 2017	2,764		$	27.61

Assumption For Fair Value of Options Granted

The fair value of stock option awards granted in 2017 and 2016 was estimated on the date of grant using the Black-Scholes option valuation model using the following assumptions:



	Six Months Ended
	2017		2016
Risk-free interest rate	2.0	%	2.0	%
Weighted average expected life (years)	5.8 years		5.8 years
Expected volatility	25.1	%	26.0	%
Dividend yield	1.9	%	2.0	%

Summarized Information of Stock Options Outstanding

The following table summarizes other information about the stock options at June 30, 2017:



	June 30, 2017
	(in thousands, except per share data)
Outstanding:
Aggregate intrinsic value	$	53,140
Weighted average remaining contractual life (years)	6.5 years
Exercisable:
Number of options	1,305
Weighted average exercise price	$	20.51
Aggregate intrinsic value	$	34,338
Weighted average remaining contractual life (years)	4.5 years

Schedule of Restricted Stock Outstanding Stock-based Compensation

A summary of the outstanding restricted stock units as of December 31, 2016 and changes during the six months ended June 30, 2017 is as follows:



	Units	Weighted Average Grant Date Fair Value
	(in thousands)
December 31, 2016	—	$	—
Granted	81	$	39.38
Vested	—	$	—
Forfeited	—	$	—
June 30, 2017	81	$	39.38

A summary of the outstanding restricted stock awards as of December 31, 2016 and changes during the six months ended June 30, 2017 is as follows:



	Shares		Weighted Average Grant Date Fair Value
	(in thousands)
December 31, 2016	74		$	32.09
Granted	—		$	—
Vested	(18	)	$	31.41
Forfeited	—		$	—
June 30, 2017	56		$	32.30

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The stock-based compensation expense associated with the options granted under the ESPP during the six months ended June 30, 2017 and 2016 was estimated on the date of grant using the Black-Scholes option valuation model using the following assumptions:



	Six Months Ended June 30,
	2017	2016
Risk-free interest rate	1.05%	0.58%
Weighted average expected life (years)	1.0	1.0
Expected volatility	21.2%	19.7%
Dividend yield	1.9%	2.0%

Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments

The following table summarizes information about the SERP during the six months ended June 30, 2017 and 2016:



	Six Months Ended June 30,
	2017		2016
	(in thousands)
SERP expense⁽¹⁾	$	308	$	309
Unrealized gain recorded in SERP liability account	$	2,313	$	218

⁽¹⁾ Both the SERP match and the deferrals are included in the selling, general and administrative caption in the consolidated statements of comprehensive income.

Tabular disclosure of an equity-based arrangement (such as stock or unit options and stock or unit awards) with an individual employee, which is generally an employment contract between the entity and a selected officer or key employee containing a promise by the employer to pay certain equity-based awards at future dates, sometimes including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares or units issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability.

Dividends (Tables)

6 Months Ended

Jun. 30, 2017

Schedule of Dividends Payable

During the six months ended June 30, 2017, the Company paid regular quarterly cash dividends totaling approximately $27.4 million as follows:



	Quarter Ended
	March 31, 2017		June 30, 2017
	(in thousands, except per share amounts)
Cash dividends paid per common share	$	0.18625	$	0.18750
Total cash dividends paid	$	13,624	$	13,750
Record date	February 17, 2017		May 19, 2017
Payment date	March 24, 2017		June 23, 2017

Schedule of Dividends Payable on Outstanding Weighted Average Number of Basic Common Shares

Cash dividends declared on the outstanding weighted average number of basic common shares for the periods presented were as follows:



	Three Months Ended June 30,				Six Months Ended June 30, 2017
	2017		2016		2017		2016
Cash dividends declared per common share	$	0.18875	$	0.18375	$	0.37625	$	0.36625

Segment Information (Tables)

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Schedule of Information of Reportable Segments



	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	(in thousands)
Revenues
Housekeeping	$	242,919		$	238,291		$	486,342		$	476,570
Dietary	227,957			148,265			389,024			294,793
Total	$	470,876		$	386,556		$	875,366		$	771,363

Income before income taxes
Housekeeping	$	21,474		$	22,821		$	44,676		$	45,321
Dietary	13,142			9,071			23,367			18,219
Corporate and eliminations ⁽¹⁾	(1,538		)	(2,209		)	(2,686		)	(4,253		)
Total	$	33,078		$	29,683		$	65,357		$	59,287

⁽¹⁾

Primarily represents corporate office costs and related overhead, recording of certain inventories and supplies and workers compensation costs at the reportable segment level which use accounting methods that differ from those used at the corporate level, as well as consolidated subsidiaries’ operating expenses that are not allocated to the reportable segments, net of investment and interest income.

Earnings Per Common Share (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares

The table below reconciles the weighted-average basic and diluted common shares outstanding:



	Three Months Ended June 30,		Six Months Ended June 30,
	2017	2016	2017	2016
	(in thousands)
Weighted average number of common shares outstanding - basic	73,276	72,568	73,176	72,466
Effect of dilutive securities⁽¹⁾	993	748	932	699
Weighted average number of common shares outstanding - diluted	74,269	73,316	74,108	73,165

⁽¹⁾

Certain outstanding stock option awards are anti-dilutive and were therefore excluded from the calculation of the weighted average number of diluted common shares outstanding. During the three and six months ended June 30, 2017, options to purchase 0.5 million shares having a weighted average exercise price of $39.38 per share were excluded. During the three and six months ended June 30, 2016, options to purchase 0.6 million shares having a weighted average exercise price of $34.14 per share were excluded.

Description of Business and Significant Accounting Policies (Details)	6 Months Ended
	Jun. 30, 2017 financial_institution segment	Dec. 31, 2016 financial_institution
Schedule of Accounting Policies [Line Items]
Service term	1 year
Number of reportable segments \| segment	2
Amortization period of inventories and supplies	24 months
Number of financial institutions holding cash and cash equivalents and marketable securities \| financial_institution	1	1
Minimum
Schedule of Accounting Policies [Line Items]
Days to notify cancellation of service	30 days
Initial period of service term	60 days
Maximum
Schedule of Accounting Policies [Line Items]
Days to notify cancellation of service	90 days
Initial period of service term	120 days

Changes in Accumulated Other Comprehensive Income by Component - Summary of Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Accumulated other comprehensive income
Beginning balance	$ 338,842
Other comprehensive income before reclassifications	963	$ 1,286
Losses (gains) reclassified from other comprehensive income	118	(153)
Net current period change in other comprehensive income	1,081	1,133
Ending balance	376,077
Available-for-sale securities, tax	600	600
Accumulated Other Comprehensive Income (Loss), net of taxes
Accumulated other comprehensive income
Beginning balance	(319)	543
Ending balance	$ 762	$ 1,676

Changes in Accumulated Other Comprehensive Income by Component - Reclassification Adjustments Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax expense (benefit)	$ (10,527)		$ (10,923)		$ (20,789)	$ (21,901)
Net income	22,551		18,760		44,568	37,386
Realized Gains (Losses) on Sale of Available-for-sale Securities \| Amounts Reclassified from Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gains (losses) from the sale of available-for-sale securities	(125)	$ (48)	181	$ 62	(173)	243
Tax expense (benefit)	40	15	(67)	(23)	55	(90)
Net income	$ (85)	$ (33)	$ 114	$ 39	$ (118)	$ 153

Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total property and equipment, at cost	$ 35,178		$ 35,178		$ 34,019
Less accumulated depreciation	21,779		21,779		20,564
Total property and equipment, net	13,399		13,399		13,455
Depreciation	1,300	$ 1,300	2,600	$ 2,400
Housekeeping and Dietary equipment
Property, Plant and Equipment [Line Items]
Total property and equipment, at cost	21,783		21,783		21,136
Computer hardware and software
Property, Plant and Equipment [Line Items]
Total property and equipment, at cost	12,241		12,241		11,750
Other
Property, Plant and Equipment [Line Items]
Total property and equipment, at cost	$ 1,154		$ 1,154		$ 1,133

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Goodwill [Line Items]
Goodwill	$ 50,473		$ 50,473		$ 44,438
Amortization expense	1,100	$ 700	$ 1,700	$ 1,500
Customer Relationships
Goodwill [Line Items]
Weighted-average amortization period of finite-lived intangible assets			9 years 11 months
Housekeeping Segment
Goodwill [Line Items]
Goodwill	42,400		$ 42,400		42,300
Dietary Segment
Goodwill [Line Items]
Goodwill	$ 8,100		$ 8,100		$ 2,100

Goodwill and Other Intangible Assets - Estimated Amortization Expense For Intangibles Subject To Amortization (Details) $ in Thousands	Jun. 30, 2017 USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
July 1 to December 31, 2017	$ 2,143
2018	4,188
2019	3,990
2020	3,990
2021	3,990
2022	3,990
Thereafter	$ 9,039

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Unrealized gain on available-for-sale marketable securities, net of taxes	$ 602	$ 578	$ 1,081	$ 1,133
Proceeds from available for sale municipal bonds	7,000	3,100	14,500	5,200
Realized gains (losses) from the sale of available for sale securities	$ (125)	$ 181	$ (173)	$ 243

Fair Value Measurements - Marketable Securities and Deferred Compensation Fund Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 70,082	$ 67,730
Deferred compensation fund	26,326	24,119
Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	23,964	20,972
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	2,362	3,147
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	0	0
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	26,326	24,119
Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	26,326	24,119
Municipal bonds — available-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	70,082	67,730
Municipal bonds — available-for-sale \| Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Municipal bonds — available-for-sale \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	70,082	67,730
Municipal bonds — available-for-sale \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Municipal bonds — available-for-sale \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	70,082	67,730
Municipal bonds — available-for-sale \| Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	70,082	67,730
Money Market \| Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	0	0
Money Market \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	2,362	3,147
Money Market \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	0	0
Money Market \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	2,362	3,147
Money Market \| Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	2,362	3,147
Balanced and Lifestyle \| Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	7,897	7,162
Balanced and Lifestyle \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	0	0
Balanced and Lifestyle \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	0	0
Balanced and Lifestyle \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	7,897	7,162
Balanced and Lifestyle \| Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	7,897	7,162
Large Cap Growth \| Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	6,852	5,583
Large Cap Growth \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	0	0
Large Cap Growth \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	0	0
Large Cap Growth \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	6,852	5,583
Large Cap Growth \| Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	6,852	5,583
Small Cap Growth \| Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	3,189	2,933
Small Cap Growth \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	0	0
Small Cap Growth \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	0	0
Small Cap Growth \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	3,189	2,933
Small Cap Growth \| Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	3,189	2,933
Fixed Income \| Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	3,009	2,752
Fixed Income \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	0	0
Fixed Income \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	0	0
Fixed Income \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	3,009	2,752
Fixed Income \| Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	3,009	2,752
International \| Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	1,379	1,132
International \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	0	0
International \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	0	0
International \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	1,379	1,132
International \| Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	1,379	1,132
Mid Cap Growth \| Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	1,638	1,410
Mid Cap Growth \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	0	0
Mid Cap Growth \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	0	0
Mid Cap Growth \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	1,638	1,410
Mid Cap Growth \| Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation fund	$ 1,638	$ 1,410

Fair Value Measurements - Marketable Debt Securities (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	$ 68,910	$ 68,220
Gross Unrealized Gains	1,258	178
Gross Unrealized Losses	(86)	(668)
Estimated Fair Value	70,082	67,730
Other-than-temporary Impairments	0	0
Municipal bonds — available-for-sale
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Amortized Cost	68,910	68,220
Gross Unrealized Gains	1,258	178
Gross Unrealized Losses	(86)	(668)
Estimated Fair Value	70,082	67,730
Other-than-temporary Impairments	$ 0	$ 0

Fair Value Measurements - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Maturing in one year or less	$ 960	$ 973
Maturing in second year through fifth year	18,260	28,671
Maturing in sixth year through tenth year	22,980	21,651
Maturing after ten years	27,882	16,435
Total debt securities	$ 70,082	$ 67,730

Share-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total pre-tax stock-based compensation expense charged against income	$ 2,873	$ 2,091
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total pre-tax stock-based compensation expense charged against income	2,040	1,605
Restricted stock and restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total pre-tax stock-based compensation expense charged against income	584	273
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total pre-tax stock-based compensation expense charged against income	$ 249	$ 213

Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 13.7
Period of expense of unrecognized compensation cost, years	3 years 2 months 12 days
Common stock reserved for future issuance (in shares)	3,600,000
Shares available for future grant (in shares)	700,000
Maximum term of grants	10 years
Options vested and exercisable, period	5 years
Weighted average grant-date fair value of stock options granted (in dollars per share)	$ 8.52	$ 7.46
Aggregate intrinsic value of stock options exercised	$ 7.0	$ 3.9
Supplemental Employee Retirement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)	1,000,000
Remaining shares authorized for issuance (in shares)	400,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)	0	44,000
Weighted average grant date fair value of restricted stock granted (in dollars per share)	$ 0.00	$ 34.14
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)	81,000	0
Weighted average grant date fair value of restricted stock granted (in dollars per share)	$ 39.38
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant (in shares)	2,300,000
Requisite service period for plan participation eligibility	2 years
Stock options authorized to issue to employees (in shares)	4,100,000

Share-Based Compensation - Summary of Stock Options Outstanding (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Number of Shares
December 31, 2016 (in shares) \| shares	2,615
Granted (in shares) \| shares	544
Canceled (in shares) \| shares	(61)
Exercised (in shares) \| shares	(334)
June 30, 2017 (in shares) \| shares	2,764
Weighted Average Exercise Price
December 31, 2016 (in dollars per share) \| $ / shares	$ 24.61
Granted (in dollars per share) \| $ / shares	39.38
Canceled (in dollars per share) \| $ / shares	33.96
Exercised (in dollars per share) \| $ / shares	22.14
June 30, 2017 (in dollars per share) \| $ / shares	$ 27.61

Share-Based Compensation - Assumptions for Fair Value of Options Granted (Details)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk-free interest rate	2.00%	2.00%
Weighted average expected life (years)	5 years 9 months 18 days	5 years 9 months 18 days
Expected volatility	25.10%	26.00%
Dividend yield	1.90%	2.00%

Share-Based Compensation - Summarized Information About Stock Awards (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) $ / shares shares
Outstanding:
Aggregate intrinsic value	$ 53,140
Weighted average remaining contractual life (years)	6 years 6 months
Exercisable:
Number of shares (in shares) \| shares	1,305
Weighted average exercise price (in dollars per share) \| $ / shares	$ 20.51
Aggregate intrinsic value	$ 34,338
Weighted average remaining contractual life (years)	4 years 6 months

Share-Based Compensation - Summary of Restricted Stock Activity (Details) - $ / shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Restricted Stock
Shares
December 31, 2016 (in shares)	74,000
Granted (in shares)	0	44,000
Vested (in shares)	(18,000)
Forfeited (in shares)	0
June 30, 2017 (in shares)	56,000
Weighted Average Grant Date Fair Value
December 31, 2016 (in dollars per share)	$ 32.09
Granted (in dollars per share)	0.00	$ 34.14
Vested (in dollars per share)	31.41
Forfeited (in dollars per share)	0.00
June 30, 2017 (in dollars per share)	$ 32.30
Restricted Stock Units (RSUs)
Shares
December 31, 2016 (in shares)	0
Granted (in shares)	81,000	0
Vested (in shares)	0
Forfeited (in shares)	0
June 30, 2017 (in shares)	81,000
Weighted Average Grant Date Fair Value
December 31, 2016 (in dollars per share)	$ 0.00
Granted (in dollars per share)	39.38
Vested (in dollars per share)	0.00
Forfeited (in dollars per share)	0.00
June 30, 2017 (in dollars per share)	$ 39.38

Share-Based Compensation - Assumptions For Employee Stock Purchase Plan (Details)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.00%	2.00%
Weighted average expected life (years)	5 years 9 months 18 days	5 years 9 months 18 days
Expected volatility	25.10%	26.00%
Dividend yield	1.90%	2.00%
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.05%	0.58%
Weighted average expected life (years)	1 year	1 year
Expected volatility	21.20%	19.70%
Dividend yield	1.90%	2.00%

Share-Based Compensation - Deferred Compensation Plan (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
SERP expense	$ 2,873	$ 2,091
Supplemental Employee Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
SERP expense	308	309
Unrealized gain recorded in SERP liability account	$ 2,313	$ 218

Dividends - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended			6 Months Ended
	Jul. 11, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Equity [Abstract]
Dividends paid		$ 13,750	$ 13,624		$ 27,374	$ 26,451
Subsequent Event [Line Items]
Dividends declared (in dollars per share)		$ 0.18875		$ 0.18375	$ 0.37625	$ 0.36625
Subsequent Event
Subsequent Event [Line Items]
Dividends declared (in dollars per share)	$ 0.18875

Dividends - Schedule of Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Equity [Abstract]
Cash dividends paid per common share (in dollars per share)	$ 0.18750	$ 0.18625
Total cash dividends paid	$ 13,750	$ 13,624	$ 27,374	$ 26,451

Dividends - Cash Dividends per Common Share (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Equity [Abstract]
Dividends declared (in dollars per share)	$ 0.18875	$ 0.18375	$ 0.37625	$ 0.36625

Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Subsequent Event [Line Items]
Unrecognized tax benefits		$ 0
Forecast
Subsequent Event [Line Items]
Effective tax rate	33.70%
Effective tax rate, excluding impact of ASU 2016-09	35.70%

Related Party Transactions (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Related Party Transactions [Abstract]
Fees paid to related party firm (less than)	$ 120	$ 120
Percentage of fee paid to related party in relation to related party's total revenue (less than)	5.00%	5.00%

Segment Information - Schedule of Information of Reportable Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment	Jun. 30, 2016 USD ($)
Segment Reporting [Abstract]
Number of reportable segments \| segment			2
Segment Reporting Information [Line Items]
Revenues	$ 470,876	$ 386,556	$ 875,366	$ 771,363
Income before income taxes	33,078	29,683	65,357	59,287
Housekeeping
Segment Reporting Information [Line Items]
Revenues	242,919	238,291	486,342	476,570
Dietary
Segment Reporting Information [Line Items]
Revenues	227,957	148,265	389,024	294,793
Operating Segments \| Housekeeping
Segment Reporting Information [Line Items]
Income before income taxes	21,474	22,821	44,676	45,321
Operating Segments \| Dietary
Segment Reporting Information [Line Items]
Income before income taxes	13,142	9,071	23,367	18,219
Corporate and eliminations
Segment Reporting Information [Line Items]
Income before income taxes	$ (1,538)	$ (2,209)	$ (2,686)	$ (4,253)

Earnings Per Common Share - Computation of Basic and Diluted Net Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Weighted average number of common shares outstanding - basic (in shares)	73,276	72,568	73,176	72,466
Effect of dilutive securities (in shares)	993	748	932	699
Weighted average number of common shares outstanding - diluted (in shares)	74,269	73,316	74,108	73,165

Earnings Per Common Share - Additional Information (Details) - $ / shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Options outstanding to purchase common stock excluded from computation of diluted earnings per common share (in shares)	0.5	0.6	0.5	0.6
Antidilutive securities excluded from earnings per share, average exercise price (in dollars per share)	$ 39.38	$ 34.14	$ 39.38	$ 34.14

Other Contingencies (Details)	6 Months Ended
Other Contingencies (Details)	Jun. 30, 2017 USD ($) financial_covenant	Jul. 11, 2017 USD ($)	Jul. 03, 2017 USD ($)	Dec. 31, 2016 USD ($)
Short-term Debt [Line Items]
Bank line of credit	$ 200,000,000
Borrowings under line of credit	$ 16,182,000			$ 0
Number of financial covenants \| financial_covenant	1
Reduction of bank line of credit	$ 70,700,000
Amount available under line of credit	129,300,000
Subsequent Event
Short-term Debt [Line Items]
Bank line of credit		$ 300,000,000
Amount available under line of credit			$ 125,800,000
Standby Letter Of Credit
Short-term Debt [Line Items]
Irrevocable standby letter of credit, outstanding	$ 70,700,000
Standby Letter Of Credit \| Subsequent Event
Short-term Debt [Line Items]
Irrevocable standby letter of credit, outstanding			$ 74,200,000

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.