Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2008	$ 58,547,000	$ 31,000	$ 167,468,000	$ 0	$ (108,952,000)	$ 0
Common Stock, Shares, Outstanding at Dec. 31, 2008		30,884,994
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	(11,290,000)				(11,290,000)
Proceeds from sale of common stock, net of issuance costs	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		94,700
Proceeds from Stock Options Exercised	247,000		247,000
Stock Repurchased During Period, Shares	(174,628)	(174,628)
Payments for Repurchase of Common Stock	(1,107,000)		(1,107,000)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		1,107,000
Share-based Compensation	7,065,000	1,000	7,064,000
Excess Tax Benefit from Share-based Compensation, Financing Activities	0
Net Income (Loss) Attributable to Noncontrolling Interest	5,657,000					5,657,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(3,150,000)					(3,150,000)
Balance at Dec. 31, 2009	55,969,000	32,000	173,672,000	0	(120,242,000)	2,507,000
Common Stock, Shares, Outstanding at Dec. 31, 2009		31,912,066
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	34,051,000				34,051,000
Proceeds from sale of common stock, net of issuance costs	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		2,852,002
Proceeds from Stock Options Exercised	15,068,000	3,000	15,065,000
Payments for Repurchase of Common Stock	0
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		1,265,000
Share-based Compensation	7,121,000	1,000	7,120,000
Excess Tax Benefit from Share-based Compensation, Financing Activities	1,302,000		1,302,000
Net Income (Loss) Attributable to Noncontrolling Interest	2,965,000					2,965,000
Proceeds from (Payments to) Noncontrolling Interests	2,317,000					2,317,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(4,807,000)					(4,807,000)
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	(133,000)		(133,000)
Balance at Dec. 31, 2010	113,853,000	36,000	197,026,000	0	(86,191,000)	2,982,000
Common Stock, Shares, Outstanding at Dec. 31, 2010	36,029,068	36,029,068
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	21,106,000				21,106,000
Stock Issued During Period, Shares, New Issues	5,750,000	5,750,000
Proceeds from sale of common stock, net of issuance costs	175,229,000	6,000	175,223,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	87,000	87,068
Proceeds from Stock Options Exercised	411,000		411,000
Payments for Repurchase of Common Stock	0
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		1,061,865
Share-based Compensation	13,579,000	1,000	13,578,000
Excess Tax Benefit from Share-based Compensation, Financing Activities	583,000		583,000
Net Income (Loss) Attributable to Noncontrolling Interest	539,000					539,000
Proceeds from (Payments to) Noncontrolling Interests	1,539,000					1,539,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(2,897,000)					(2,897,000)
Other Comprehensive Income (Loss), Net of Tax	(1,830,000)			(1,830,000)
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	(5,896,000)
Balance at Dec. 31, 2011	$ 322,112,000	$ 43,000	$ 386,821,000	$ (1,830,000)	$ (65,085,000)	$ 2,163,000
Common Stock, Shares, Outstanding at Dec. 31, 2011	42,928,001	42,928,001