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, 2012	$ 144,499	$ 4	$ 178,219	$ (34,547)	$ 823
Balance (in shares) at Dec. 31, 2012		35,483
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock options	214		214
Issuance of common stock upon exercise of stock options (in shares)	167	167
Stock-based compensation expense	602		602
Excess tax benefits from stock-based compensation	4,039		4,039
Non-controlling interests distributions	(579)				(579)
Net (loss) income	(988)			(1,121)	133
Balance at Mar. 31, 2013	$ 147,787	$ 4	$ 183,074	$ (35,668)	$ 377
Balance (in shares) at Mar. 31, 2013		35,650