Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current deferred tax assets:
Allowance for doubtful accounts	$ 3,772	$ 3,049
Accrued liabilities	5,011	5,895
Subtotal	8,783	8,944
Less valuation allowance	(272)	(319)
Total current deferred tax assets	8,511	8,625
Current deferred tax liabilities:
Prepaid expenses	(867)	(626)
Net deferred tax assets, current	7,644	7,999
Noncurrent deferred tax assets:
Net operating loss and other carryforwards	1,260	1,040
Credit carryforwards	3,162	2,612
Deferred lease costs	107	167
Depreciation	2,122	1,184
Tax goodwill and intangibles	(1,296)	(1,172)
Stock-based compensation	629	534
Accrued rent	3,118	3,055
Kentucky and Kansas acquisition costs	6	113
Impairment of long-lived assets	269	267
Interest rate swap	49	237
Hedge Ineffectiveness	(69)	0
Noncurrent self-insurance liabilities	4,633	4,185
Other	11	0
Subtotal	14,001	12,222
Less valuation allowance	(460)	(460)
Total noncurrent deferred tax assets	$ 13,541	$ 11,762