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 Shareholders [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
Beginning Balance, shares at Dec. 31, 2012		7,826,674				245,000
Net income (loss)	13,942			13,960			13,960	(18)	243
Net unrealized gain on securities available-for-sale	233				233		233
Activity of noncontrolling interests, net									(1,264)
Repurchase of common shares	(10,356)					(10,356)	(10,356)
Repurchase of common shares, shares		(60,000)				60,000
Issuance of common stock related to employee stock transactions	126		126				126
Issuance of common stock related to employee stock transactions, shares		53,465
Taxes paid on stock-based compensation	(5,157)		(5,157)				(5,157)
Stock-based compensation	1,868		1,868				1,868
Ending Balance at Mar. 31, 2013	245,127	81	939,662	(666,451)	(54)	(28,090)	245,148	(21)	2,142
Ending Balance, shares at Mar. 31, 2013		7,820,139				305,000
Beginning Balance at Dec. 31, 2013	492,868	95	1,135,644	(605,221)	(150)	(37,438)	492,930	(62)	42,186
Beginning Balance, shares at Dec. 31, 2013		9,105,521				350,000
Net income (loss)	21,928	0	0	21,938	0	0	21,938	(10)	(161)
Net unrealized gain on securities available-for-sale	63	0	0	0	63	0	63	0	0
Foreign currency translation adjustment	24	0	0	0	24	0	24	0	0
Activity of noncontrolling interests, net	0	0	0	0	0	0	0	0	(38,158)
Issuance of common stock related to employee stock transactions	105	0	105	0	0	0	105	0	0
Issuance of common stock related to employee stock transactions, shares		57,619
Taxes paid on stock-based compensation	(7,401)	0	(7,401)	0	0	0	(7,401)	0	0
Stock-based compensation	2,509	0	2,509	0	0	0	2,509	0	0
Ending Balance at Mar. 31, 2014	$ 510,096	$ 95	$ 1,130,857	$ (583,283)	$ (63)	$ (37,438)	$ 510,168	$ (72)	$ 3,867
Ending Balance, shares at Mar. 31, 2014		9,163,140				350,000