Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current deferred tax assets:
Credit carryforwards	$ 0	$ 251
Net operating loss and other carryforwards	643	352
Allowance for doubtful accounts	1,788	1,447
Accrued liabilities	5,126	4,236
Subtotal	7,557	6,286
Less valuation allowance	(377)	(242)
Total current deferred tax assets	7,180	6,044
Current deferred tax liabilities:
Prepaid expenses	(601)	(739)
Net deferred tax assets, current	6,579	5,305
Noncurrent deferred tax assets:
Net operating loss and other carryforwards	3,389	1,365
Credit carryforwards	2,210	964
Deferred lease costs	289	356
Depreciation	(634)	(2,036)
Tax goodwill and intangibles	(879)	(739)
Stock-based compensation	882	1,238
Accrued rent	4,219	4,538
Kansas acquisition costs	125	0
Impairment of long-lived assets	472	659
Interest rate swap	349	564
Noncurrent self-insurance liabilities	6,422	6,062
Subtotal	16,844	12,971
Less valuation allowance	(932)	(619)
Total noncurrent deferred tax assets	$ 15,912	$ 12,352