CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Noncontrolling Interest
Beginning balance (deficit) at Dec. 31, 2009	$ 14,677	$ 15	$ 91,793	$ 313	$ (77,372)	$ (72)
Beginning balance at Dec. 31, 2009		15,385,428
Increase (Decrease) in Stockholders' Equity
Net income	17,108				16,840	268
Foreign currency translation adjustments	169			169
Cash flow hedge	(379)			(379)
Proceeds from exercise of stock options	1,773	1	1,772
Proceeds from exercise of stock options (in shares)		385,027
Issuance of stock grants	245		245
Issuance of stock grants (in shares)		14,396
Retirement of common stock (in 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 noncontrolling interest	(271)					(271)
Ending balance (deficit) at Dec. 31, 2010	36,803	16	97,291	103	(60,532)	(75)
Ending balance at Dec. 31, 2010		15,775,645
Increase (Decrease) in Stockholders' Equity
Net income	18,278				17,900	378
Foreign currency translation adjustments	(390)			(390)
Cash flow hedge	(31)			(31)
Repurchase of common stock	(7,544)	(1)	(7,543)
Repurchase of common stock (in shares)		(461,512)
Proceeds from exercise of stock options	217		217
Proceeds from exercise of stock options (in shares)		68,322
Issuance of stock grants	245		245
Issuance of stock grants (in shares)		14,009
Vested restricted stock units (in 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 noncontrolling interest	(388)					(388)
Ending balance (deficit) at Dec. 31, 2011	49,642	15	92,662	(318)	(42,632)	(85)
Ending balance at Dec. 31, 2011	15,464,864	15,464,864
Increase (Decrease) in Stockholders' Equity
Net income	4,154				3,120	1,034
Foreign currency translation adjustments	2			2
Cash flow hedge	(65)			(65)
Shares issued-Central Merger	140,726	7	140,719
Shares issued-Central Merger (in shares)		6,161,332
Proceeds from exercise of stock options	526		526
Proceeds from exercise of stock options (in shares)		81,023
Issuance of stock grants	165		165
Issuance of stock grants (in shares)		8,751
Vested restricted stock units (in shares)		154,800
Non-cash stock-based compensation related to restricted stock units	1,857		1,857
Tax benefit from exercise of stock options	446		446
Purchase of Central shares of noncontrolling interest	677					677
Distribution to noncontrolling interest	(874)					(874)
Ending balance (deficit) at Dec. 31, 2012	$ 197,256	$ 22	$ 236,375	$ 571	$ (38,735)	$ 752
Ending balance at Dec. 31, 2012	21,870,770	21,870,770