CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Non-Controlling Interest [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balances at Dec. 31, 2008	$ 2	$ 102,706	$ 13,104	$ 0	$ (2,022)	$ 113,790
Balances (in shares) at Dec. 31, 2008	17,921,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	13,556	0	0	13,556
Foreign currency translation adjustment	0	0	0	0	774	774
Comprehensive income (loss)						14,330
Payment of income tax withheld on vested restricted stock	0	(14)	0	0	0	(14)
Payment of income tax withheld on vested restricted stock (in shares)	(4,000)
Stock based compensation	0	992	0	0	0	992
Balances at Dec. 31, 2009	2	103,684	26,660	0	(1,248)	129,098
Balances (in shares) at Dec. 31, 2009	17,917,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	28,383	(181)	0	28,202
Foreign currency translation adjustment	0	0	0	0	(1,262)	(1,262)
Comprehensive income (loss)						26,940
Contributions from non-controlling interest	0	0	0	18,256	0	18,256
Issuance of common stock, net of underwriting discount and offering expenses	0	22,353	0	0	0	22,353
Issuance of common stock, net of underwriting discount and offering expenses (in shares)	1,381,000
Payment of income tax withheld on vested restricted stock	0	(42)	0	0	0	(42)
Payment of income tax withheld on vested restricted stock (in shares)	(3,000)
Stock based compensation	0	1,069	0	0	0	1,069
Balances at Dec. 31, 2010	2	127,064	55,043	18,075	(2,510)	197,674
Balances (in shares) at Dec. 31, 2010	19,295,000					19,295,359
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	50,189	625	0	50,814
Foreign currency translation adjustment	0	0	0	0	(871)	(871)
Comprehensive income (loss)						49,943
Stock based compensation	0	1,119	0	0	0	1,119
Balances at Dec. 31, 2011	$ 2	$ 128,183	$ 105,232	$ 18,700	$ (3,381)	$ 248,736
Balances (in shares) at Dec. 31, 2011	19,295,000					19,295,359