CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total USD ($)	Common Stock	Common Stock and Additional Paid-in Capital USD ($)	Accumulated Deficit USD ($)	Accumulated Other Comprehensive Income (Loss) USD ($)	Treasury Stock USD ($)	Noncontrolling Interest in Subsidiary USD ($)
Beginning balance at Dec. 31, 2011	$ 1,164,127		$ 1,931,094	$ (305,669)	$ 63,743	$ (525,041)
Beginning balance (in shares) at Dec. 31, 2011		137,855
Net (loss) income	(258,720)			(258,720)
Change in cumulative foreign currency translation adjustment	23,419				23,419
Repurchase of common stock	(65,611)					(65,611)
Tax withholdings related to net share settlements of restricted stock awards and units (in shares)		(1,099)
Tax withholdings related to net share settlements of restricted stock awards and units	(8,482)					(8,482)
Issuance of common stock for stock option exercises (in shares)	3	3
Issuance of common stock for stock option exercises	23		23
Tax provision for stock-based compensation	(5,319)		(5,319)
Stock based compensation-restricted stock	30,551		30,551
Stock based compensation-restricted stock (in shares)		3,078
Stock based compensation-stock options	51		51
Ending balance at Dec. 31, 2012	880,039		1,956,400	(564,389)	87,162	(599,134)
Ending balance (in shares) at Dec. 31, 2012		139,837
Net (loss) income	(289)			(482)			193
Change in cumulative foreign currency translation adjustment	(23,859)				(23,794)		(65)
Repurchase of common stock	(107,167)					(107,167)
Tax withholdings related to net share settlements of restricted stock awards and units (in shares)		(1,187)
Tax withholdings related to net share settlements of restricted stock awards and units	(6,061)					(6,061)
Sale of noncontrolling interest	72,624		18,278				54,346
Tax provision for stock-based compensation	166		166
Stock based compensation-restricted stock	28,692		28,692
Stock based compensation-restricted stock (in shares)		3,021
Ending balance at Dec. 31, 2013	844,145		2,003,536	(564,871)	63,368	(712,362)	54,474
Ending balance (in shares) at Dec. 31, 2013		141,671
Net (loss) income	(283,807)			(289,289)			5,482
Change in cumulative foreign currency translation adjustment	(56,811)				(54,123)		(2,688)
Repurchase of common stock	(52,070)					(52,070)
Tax withholdings related to net share settlements of restricted stock awards and units (in shares)		(2,043)
Tax withholdings related to net share settlements of restricted stock awards and units	(10,508)					(10,508)
Equity component of convertible note issuance, net	18,766		18,766
Purchase of capped call	(16,531)		(16,531)
Cash dividend	(3,021)						(3,021)
Tax provision for stock-based compensation	(2,058)		(2,058)
Stock based compensation-restricted stock	36,640		36,640
Stock based compensation-restricted stock (in shares)		4,733
Ending balance at Dec. 31, 2014	$ 474,745		$ 2,040,353	$ (854,160)	$ 9,245	$ (774,940)	$ 54,247
Ending balance (in shares) at Dec. 31, 2014		144,361