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, 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				350,000
Net income (loss)	21,928			21,938			21,938	(10)	(161)
Net unrealized gains on securities available-for-sale	63				63		63
Foreign currency translation adjustments	24				24		24
Activity of noncontrolling interests, net									(38,158)
Issuance of common stock related to employee stock transactions	105		105				105
Issuance of common stock related to employee stock transactions, Shares		57,619
Taxes paid on stock-based compensation	(7,401)		(7,401)				(7,401)
Stock-based compensation	2,246		2,246				2,246
Excess tax benefits from stock-based compensation	263		263				263
Ending Balance at Mar. 31, 2014	510,096	95	1,130,857	(583,283)	(63)	(37,438)	510,168	(72)	3,867
Balance, Shares at Mar. 31, 2014		9,163,140				350,000
Beginning Balance at Dec. 31, 2014	563,352	96	1,148,908	(507,521)	(242)	(77,699)	563,542	(190)	23,071
Balance, Shares at Dec. 31, 2014	8,975,833	8,975,833				575,441
Net income (loss)	19,308			19,342			19,342	(34)	417
Net unrealized gains on securities available-for-sale	4				4		4
Foreign currency translation adjustments	(271)				(271)		(271)
Activity of noncontrolling interests, net									11,489
Cash dividends declared ($0.45 per common share)	(4,095)		(4,095)				(4,095)
Repurchases of common shares	(14,000)					(14,000)	(14,000)
Repurchases of common shares, Shares	103,818	(103,818)				103,818
Issuance of common stock related to employee stock transactions	54		54				54
Issuance of common stock related to employee stock transactions, Shares		39,851
Taxes paid on stock-based compensation	(4,122)		(4,122)				(4,122)
Stock-based compensation	3,784		3,784				3,784
Excess tax benefits from stock-based compensation	1,130		1,130				1,130
Ending Balance at Mar. 31, 2015	$ 565,144	$ 96	$ 1,145,659	$ (488,179)	$ (509)	$ (91,699)	$ 565,368	$ (224)	$ 34,977
Balance, Shares at Mar. 31, 2015	8,911,866	8,911,866				679,259