Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current deferred tax assets:
Credit carryforwards	$ 0	$ 365
Allowance for doubtful accounts	3,049	2,277
Accrued liabilities	5,895	5,386
Subtotal	8,944	8,028
Less valuation allowance	(319)	(408)
Total current deferred tax assets	8,625	7,620
Current deferred tax liabilities:
Prepaid expenses	(626)	(604)
Net deferred tax assets, current	7,999	7,016
Noncurrent deferred tax assets:
Net operating loss and other carryforwards	1,040	1,174
Credit carryforwards	2,612	2,030
Deferred lease costs	167	230
Depreciation	1,184	355
Tax goodwill and intangibles	(1,172)	(978)
Stock-based compensation	534	643
Accrued rent	3,055	3,786
Kentucky and Kansas acquisition costs	113	118
Impairment of long-lived assets	267	271
Interest rate swap	237	303
Noncurrent self-insurance liabilities	4,185	5,639
Subtotal	12,222	13,571
Less valuation allowance	(460)	(686)
Total noncurrent deferred tax assets	$ 11,762	$ 12,885