Condensed Consolidated Statements of Changes in 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 Stockholders [Member]	Non-controlling Interests [Member]	Redeemable Non-controlling Interests [Member]
Beginning Balance at Dec. 31, 2012	$ 244,471	$ 81	$ 942,825	$ (680,411)	$ (287)	$ (17,734)	$ 244,474	$ (3)	$ 3,163
Balance, shares at Dec. 31, 2012		7,826,674				245,000
Net income (loss)	29,313			29,345			29,345	(32)	(345)
Net unrealized gain on securities available-for-sale	139				139		139
Foreign currency translation adjustment	(18)				(18)		(18)
Activity of noncontrolling interests, net	0								6,603
Repurchase of common shares	(14,966)					(14,966)	(14,966)
Repurchase of common shares, shares	80,000	(80,000)				80,000
Issuance of common stock related to employee stock transactions	864		864				864
Issuance of common stock related to employee stock transactions, shares		74,159
Taxes paid on stock-based compensation	(7,172)		(7,172)				(7,172)
Stock-based compensation	3,750		3,750				3,750
Balance at Jun. 30, 2013	256,381	81	940,267	(651,066)	(166)	(32,700)	256,416	(35)	9,421
Balance, shares at Jun. 30, 2013		7,820,833				325,000
Beginning Balance at Dec. 31, 2013	492,868	95	1,135,644	(605,221)	(150)	(37,438)	492,930	(62)	42,186
Balance, shares at Dec. 31, 2013	9,105,521	9,105,521				350,000
Net income (loss)	41,441			41,481			41,481	(40)	118
Net unrealized gain on securities available-for-sale	185				185		185
Foreign currency translation adjustment	13				13		13
Activity of noncontrolling interests, net	0								(31,907)
Cash dividends declared	(4,179)		(4,179)				(4,179)
Repurchase of common shares	(12,500)					(12,500)	(12,500)
Repurchase of common shares, shares	66,913	(66,913)				66,913
Issuance of common stock related to employee stock transactions	954		954				954
Issuance of common stock related to employee stock transactions, shares		80,392
Taxes paid on stock-based compensation	(9,271)		(9,271)				(9,271)
Stock-based compensation	4,333		4,333				4,333
Excess tax benefits from stock-based compensation	583		583				583
Balance at Jun. 30, 2014	$ 514,427	$ 95	$ 1,128,064	$ (563,740)	$ 48	$ (49,938)	$ 514,529	$ (102)	$ 10,397
Balance, shares at Jun. 30, 2014	9,119,000	9,119,000				416,913