Income Taxes - Significant Components of Federal and State Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Allowance for doubtful accounts	$ 2,672	$ 1,819
Deferred compensation	8,532	9,191
Accrued insurance claims	5,862	5,786
Non-deductible reserves	1,257	4,490
Amortization of intangibles	624	971
Other	858	10
Deferred tax assets	19,805	22,267
Deferred tax liabilities:
Expensing of housekeeping supplies	(6,752)	(6,463)
Depreciation of property and equipment	(2,568)	(3,237)
Other	(663)	0
Deferred tax liabilities	(9,983)	(9,700)
Net deferred tax assets	$ 9,822	$ 12,567