Income Taxes (Significant Components of Federal and State Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Net current deferred assets (liabilities):
Allowance for doubtful accounts	$ 2,427	$ 1,560
Accrued insurance claims — current	5,974	3,574
Expensing of housekeeping supplies	(6,622)	(5,059)
Other	1,676	2,264
Net current deferred assets (liabilities)	3,455	2,339
Net noncurrent deferred assets (liabilities):
Deferred compensation	8,681	7,987
Non-deductible reserves	5	5
Depreciation of property and equipment	(3,160)	(2,933)
Accrued insurance claims — noncurrent	19,982	6,848
Amortization of intangibles	1,229	1,015
Other	496	352
Net noncurrent deferred assets	$ 27,233	$ 13,274