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, 2010	$ 29,129	$ 16	$ 97,291	$ 103	$ (68,206)	$ (75)
Beginning balance at Dec. 31, 2010	15,775,645	15,775,645
Increase (Decrease) in Stockholders' Equity
Net income	17,476				17,098	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)	(461,512)
Proceeds from exercise of stock options	217		217
Proceeds from exercise of stock options (in shares)	68,322	68,322
Issuance of stock grants	245		245
Issuance of stock grants (in shares)	14,009	14,009
Vested restricted stock units (in shares)	68,400	68,400
Non-cash stock-based compensation related to restricted stock units	2,206		2,206
Tax benefit from exercise of stock options and vesting of restricted stock units	246		246
Distribution to noncontrolling interest	(388)					(388)
Ending balance (deficit) at Dec. 31, 2011	41,166	15	92,662	(318)	(51,108)	(85)
Ending balance at Dec. 31, 2011	15,464,864	15,464,864
Increase (Decrease) in Stockholders' Equity
Net income	2,374				1,340	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	6,161,332
Proceeds from exercise of stock options	526		526
Proceeds from exercise of stock options (in shares)	81,023	81,023
Issuance of stock grants	165		165
Issuance of stock grants (in shares)	8,751	8,751
Vested restricted stock units (in shares)	154,800	154,800
Non-cash stock-based compensation related to restricted stock units	1,857		1,857
Tax benefit from exercise of stock options and vesting of restricted stock units	446		446
Purchase of Central shares of noncontrolling interest	677					677
Distribution to noncontrolling interest	(874)					(874)
Ending balance (deficit) at Dec. 31, 2012	187,000	22	236,375	(381)	(49,768)	752
Ending balance at Dec. 31, 2012	21,870,770	21,870,770
Increase (Decrease) in Stockholders' Equity
Net income	14,765				12,089	2,676
Foreign currency translation adjustments	(463)			(463)
Cash flow hedge	962			962
Issuance of stock grants (in shares)	15,576	15,576
Vested restricted stock units (in shares)	90,965	90,965
Non-cash stock-based compensation related to restricted stock units	4,092		4,092
Tax benefit from exercise of stock options and vesting of restricted stock units	198		198
Distribution to noncontrolling interest	(2,843)					(2,843)
Ending balance (deficit) at Dec. 31, 2013	$ 203,711	$ 22	$ 240,665	$ 118	$ (37,679)	$ 585
Ending balance at Dec. 31, 2013	21,977,311	21,977,311