Condensed Consolidated Statement of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Non-Controlling Interests
Balance at Dec. 31, 2011	$ 129,079	$ 3	$ 170,721	$ (41,842)	$ 197
Balance (in shares) at Dec. 31, 2011		33,584
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock options	2,125	1	2,124
Issuance of common stock upon exercise of stock options (in shares)	1,578	1,578
Stock-based compensation expense	2,163		2,163
Excess tax benefits from stock-based compensation	3,364		3,364
Non-controlling interests distributions	(579)				(579)
Net income	6,474			5,895	579
Balance at Sep. 30, 2012	$ 142,626	$ 4	$ 178,372	$ (35,947)	$ 197
Balance (in shares) at Sep. 30, 2012		35,162