Consolidated Statements of Stockholder's Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Accumulated Deficit	Noncontrolling Interest
Beginning balance at Dec. 31, 2008	$ 958	$ 16	$ 103,541	$ 85	$ (11,161)	$ (91,464)	$ (59)
Beginning balance, shares at Dec. 31, 2008		16,110,781			627,423
Net income	14,215					14,092	123
Foreign currency translation adjustments	228			228
Comprehensive income	14,443
Repurchase and retirement of common stock, shares		(843,540)			(627,423)
Repurchase and retirement of common stock	(3,885)	(1)	(15,045)		11,161
Proceeds from exercise of stock options, shares		105,896
Proceeds from exercise of stock options	415		415
Issuance of stock grants, shares		12,291
Issuance of stock grants	220		220
Stock-based compensation related to long-term incentive plan	51		51
Non-cash stock-based compensation related to restricted stock units	2,046		2,046
Non-cash stock-based compensation expense	30		30
Tax benefit from exercise of stock options	535		535
Distribution to noncontrolliing interest	(136)						(136)
Ending balance at Dec. 31, 2009	14,677	15	91,793	313	0	(77,372)	(72)
Ending balance, shares at Dec. 31, 2009		15,385,428			0
Net income	17,108					16,840	268
Foreign currency translation adjustments	169			169
Revaluation of interest rate cap	(379)			(379)
Comprehensive income	16,898
Proceeds from exercise of stock options, shares		385,027
Proceeds from exercise of stock options	1,773	1	1,772
Issuance of stock grants, shares		14,396
Issuance of stock grants	245		245
Retirement of common stock, shares		(9,206)
Non-cash stock-based compensation related to restricted stock units	2,065		2,065
Tax benefit from exercise of stock options	1,416		1,416
Distribution to noncontrolliing interest	(271)						(271)
Ending balance at Dec. 31, 2010	36,803	16	97,291	103	0	(60,532)	(75)
Ending balance, shares at Dec. 31, 2010		15,775,645			0
Net income	18,278					17,900	378
Foreign currency translation adjustments	(390)			(390)
Revaluation of interest rate cap	(31)			(31)
Comprehensive income	17,857
Exercise of stock options, shares		68,322
Proceeds from exercise of stock options	217		217
Issuance of stock grants, shares		14,009
Issuance of stock grants	245		245
Vested restricted stock units, shares		68,400
Non-cash stock-based compensation related to restricted stock units	2,206		2,206
Tax benefit from exercise of stock options	246		246
Distribution to noncontrolliing interest	(388)						(388)
Repurchase of common stock, shares		(461,512)
Repurchase of common stock	(7,544)	(1)	(7,543)
Ending balance at Dec. 31, 2011	$ 49,642	$ 15	$ 92,662	$ (318)	$ 0	$ (42,632)	$ (85)
Ending balance, shares at Dec. 31, 2011		15,464,864			0