Income Taxes - Significant Components of Federal and State Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Net current deferred assets (liabilities):
Allowance for doubtful accounts	$ 1,819	$ 2,427
Accrued insurance claims — current	1,389	5,974
Expensing of housekeeping supplies	(6,463)	(6,622)
Other	3,859	1,676
Net current deferred assets (liabilities)	604	3,455
Net noncurrent deferred assets (liabilities):
Deferred compensation	9,191	8,681
Non-deductible reserves	5	5
Depreciation of property and equipment	(3,237)	(3,160)
Accrued insurance claims — noncurrent	4,397	19,982
Amortization of intangibles	971	1,229
Other	636	496
Net noncurrent deferred assets	$ 11,963	$ 27,233