Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock [Member]	Total Attributed To Shareholders [Member]	Non-controlling Interest [Member]	Redeemable Non-controlling Interest [Member]
Beginning Balance at Dec. 31, 2011	$ 183,155,000	$ 63,000	$ 909,983,000	$ (718,083,000)	$ (14,000)	$ (8,794,000)	$ 183,155,000
Balance, shares at Dec. 31, 2011		6,188,295				155,000
Net income (loss)	37,669,000			37,672,000			37,672,000	(3,000)	104,000
Net unrealized gain (loss) on securities available-for-sale	(273,000)				(273,000)		(273,000)
Preferred stock conversion	35,217,000	14,000	35,203,000				35,217,000
Preferred stock conversion, shares		1,349,300
Activity of noncontrolling interests, net									3,059,000
Repurchase of common shares	(8,940,000)					(8,940,000)	(8,940,000)
Repurchase of common shares, shares		(90,000)				90,000
Issuance of common stock related to employee stock transactions	3,188,000	4,000	3,184,000				3,188,000
Issuance of common stock related to employee stock transactions, shares		379,079
Taxes paid on stock-based compensation	(11,951,000)		(11,951,000)				(11,951,000)
Stock-based compensation	6,406,000		6,406,000				6,406,000
Ending Balance at Dec. 31, 2012	244,471,000	81,000	942,825,000	(680,411,000)	(287,000)	(17,734,000)	244,474,000	(3,000)	3,163,000
Balance, shares at Dec. 31, 2012		7,826,674				245,000
Net income (loss)	75,131,000			75,190,000			75,190,000	(59,000)	1,999,000
Net unrealized gain (loss) on securities available-for-sale	56,000				56,000		56,000
Foreign currency translation adjustment	81,000				81,000		81,000
Activity of noncontrolling interests, net									37,024,000
Issuance of common stock, net	191,578,000	13,000	191,565,000				191,578,000
Cash dividends declared ($1.35 per common share)	0
Issuance of common stock, net, shares		1,298,386
Repurchase of common shares	(19,704,000)					(19,704,000)	(19,704,000)
Repurchase of common shares, shares	105,000	(105,000)				105,000
Issuance of common stock related to employee stock transactions	633,000	1,000	632,000				633,000
Issuance of common stock related to employee stock transactions, shares		85,461
Taxes paid on stock-based compensation	(7,513,000)		(7,513,000)				(7,513,000)
Stock-based compensation	7,657,000		7,657,000				7,657,000
Excess tax benefits from stock-based compensation	478,000		478,000				478,000
Ending Balance at Dec. 31, 2013	492,868,000	95,000	1,135,644,000	(605,221,000)	(150,000)	(37,438,000)	492,930,000	(62,000)	42,186,000
Balance, shares at Dec. 31, 2013	9,105,521	9,105,521				350,000
Net income (loss)	97,572,000	0	0	97,700,000	0	0	97,700,000	(128,000)	(607,000)
Net unrealized gain (loss) on securities available-for-sale	124,000	0	0	0	124,000	0	124,000	0	0
Foreign currency translation adjustment	(216,000)	0	0	0	(216,000)	0	(216,000)	0	0
Activity of noncontrolling interests, net	0	0	0	0	0	0	0	0	(18,508,000)
Cash dividends declared ($1.35 per common share)	(12,451,000)	0	(12,451,000)	0	0	0	(12,451,000)	0	0
Repurchase of common shares	(40,261,000)	0	0	0	0	(40,261,000)	(40,261,000)	0	0
Repurchase of common shares, shares	225,441	(225,441)				225,441
Issuance of common stock related to employee stock transactions	1,417,000	1,000	1,416,000	0	0	0	1,417,000	0	0
Issuance of common stock related to employee stock transactions, shares		95,753
Taxes paid on stock-based compensation	(9,512,000)	0	(9,512,000)	0	0	0	(9,512,000)		0
Stock-based compensation	9,006,000	0	9,006,000	0	0	0	9,006,000	0	0
Excess tax benefits from stock-based compensation	24,805,000	0	24,805,000	0	0	0	24,805,000	0	0
Ending Balance at Dec. 31, 2014	$ 563,352,000	$ 96,000	$ 1,148,908,000	$ (507,521,000)	$ (242,000)	$ (77,699,000)	$ 563,542,000	$ (190,000)	$ 23,071,000
Balance, shares at Dec. 31, 2014	8,975,833	8,975,833				575,441