Condensed Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total Attributed To Shareholders [Member]	Non-controlling Interest [Member]	Redeemable Non-controlling Interest [Member]
Beginning Balance at Dec. 31, 2011	$ 183,155	$ 63	$ 909,983	$ (718,083)	$ (14)	$ (8,794)	$ 183,155
Beginning Balance, shares at Dec. 31, 2011		6,188,295				155,000
Net income (loss)	25,459			25,459			25,459
Net unrealized gain (loss) on securities available-for-sale	(54)				(54)		(54)
Activity of noncontrolling interests, net									235
Preferred stock conversion	35,217	14	35,203				35,217
Preferred stock conversion, shares		1,349,300
Repurchase of common shares	(3,060)					(3,060)	(3,060)
Repurchase of common shares, shares		(35,000)				35,000
Issuance of common stock related to employee stock transactions	2,339	3	2,336				2,339
Issuance of common stock related to employee stock transactions, shares		334,817
Taxes paid on stock-based compensation	(11,280)		(11,280)				(11,280)
Stock-based compensation	4,921		4,921				4,921
Ending Balance at Sep. 30, 2012	236,697	80	941,163	(692,624)	(68)	(11,854)	236,697		235
Ending Balance, shares at Sep. 30, 2012		7,837,412				190,000
Beginning Balance at Dec. 31, 2012	244,474	81	942,825	(680,411)	(287)	(17,734)	244,474	(3)	3,163
Beginning Balance, shares at Dec. 31, 2012		7,826,674				245,000
Net income (loss)	50,270			50,434			50,434	(46)	(118)
Net unrealized gain (loss) on securities available-for-sale	91				91		91
Foreign currency translation adjustment	19				19		19
Activity of noncontrolling interests, net									15,810
Issuance of common stock, net	191,581	13	191,568				191,581
Issuance of common stock, net, shares		1,298,386
Repurchase of common shares	(19,704)					(19,704)	(19,704)
Repurchase of common shares, shares		(105,000)				105,000
Issuance of common stock related to employee stock transactions	983	1	982				983
Issuance of common stock related to employee stock transactions, shares		80,738
Taxes paid on stock-based compensation	(7,493)		(7,493)				(7,493)
Stock-based compensation	5,468		5,468				5,468
Ending Balance at Sep. 30, 2013	$ 465,804	$ 95	$ 1,133,350	$ (629,977)	$ (177)	$ (37,438)	$ 465,853	$ (49)	$ 18,855
Ending Balance, shares at Sep. 30, 2013		9,100,798				350,000