Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets (liabilities):
Net operating loss and other carryforwards	$ 495	$ 1,260
Credit carryforwards	3,237	3,162
Allowance for doubtful accounts	3,626	3,772
Prepaid expenses	(731)	(867)
Deferred lease costs	32	107
Depreciation	1,190	2,122
Tax goodwill and intangibles	(972)	(1,296)
Stock-based compensation	476	629
Accrued liabilities	773	5,011
Accrued rent	1,892	3,118
Kentucky and Kansas acquisition costs	4	6
Impairment of long-lived assets	186	269
Interest rate swap	(14)
Interest rate swap		49
Hedge Ineffectiveness	(106)	(69)
Noncurrent self-insurance liabilities	5,443	4,633
Other	0	11
Subtotal	15,531	21,917
Less valuation allowance	(377)	(732)
Total noncurrent deferred tax assets	$ 15,154	$ 21,185