Consolidated Statements of Stockholders Equity and Other Comprehensive Income (Loss) - USD ($) $ in Thousands	Total	4.75% Convertible Subordinated Notes [Member]	3.00% Convertible Subordinated Notes [Member]	Common stock [Member]	Common stock [Member] 4.75% Convertible Subordinated Notes [Member]	Common stock [Member] 3.00% Convertible Subordinated Notes [Member]	Treasury stock [Member]	Treasury stock [Member] 4.75% Convertible Subordinated Notes [Member]	Treasury stock [Member] 3.00% Convertible Subordinated Notes [Member]	Additional paid-in capital [Member]	Additional paid-in capital [Member] 4.75% Convertible Subordinated Notes [Member]	Additional paid-in capital [Member] 3.00% Convertible Subordinated Notes [Member]	Accumulated dividends [Member]	Accumulated other comprehensive income (loss) [Member]	Accumulated deficit [Member]
Beginning Balance at Dec. 31, 2012	$ 2,313,441			$ 49			$ (36,676)			$ 2,582,238			$ 0	$ (101,042)	$ (131,128)
Beginning Balance, shares at Dec. 31, 2012				(49,139,851)			(363,743)
Net income (loss)	96,123														96,123
Net (income) loss attributable to redeemable non-controlling interests	(1,438)														(1,438)
Other comprehensive loss	(20,251)													(20,251)
Other comprehensive (income) loss attributable to redeemable non-controlling interest	7,526													7,526
Issuance of common stock and release of treasury stock for employee equity awards	31,893			$ 1			$ 805			31,087
Issuance of common stock and release of treasury stock for employee equity awards, shares				1,093,373			8,198
Release of treasury stock upon conversions of convertible debt	6						$ 7			(1)
Release of treasury stock upon conversions of convertible debt, shares							68
Common shares repurchased	(48,799)						$ (48,799)
Common shares repurchased, shares							(288,739)
Change in redemption value of redeemable non-controlling interests	(47,940)									(47,940)
Tax benefit from employee stock plans	25,638									25,638
Stock-based compensation, net of estimated forfeitures	102,865									102,865
Ending Balance at Dec. 31, 2013	2,459,064			$ 50			$ (84,663)			2,693,887			0	(113,767)	(36,443)
Ending Balance, shares at Dec. 31, 2013				(50,233,224)			(644,216)
Net income (loss)	(260,726)														(260,726)
Net (income) loss attributable to redeemable non-controlling interests	1,179														1,179
Other comprehensive loss	(197,555)													(197,555)
Other comprehensive (income) loss attributable to redeemable non-controlling interest	(1,810)													(1,810)
Issuance of common stock and release of treasury stock for employee equity awards	29,320			$ 1			$ 1,185			28,134
Issuance of common stock and release of treasury stock for employee equity awards, shares				933,554			7,846
Common shares repurchased	(297,958)						$ (297,958)
Common shares repurchased, shares							(1,517,743)
Issuance of common stock and release of treasury stock for the exchanges and conversions of convertible debt		$ 190,732	$ 216,958		$ 2	$ 1		$ 147,706	$ 139,004		$ 43,024	$ 77,953
Issuance of common stock and release of treasury stock for the exchanges and conversions of convertible debt, debt					1,411,851	1,248,578		1,000,102	700,000
Issuance of common stock and release of treasury stock for conversions of convertible debt			$ 178,744			$ 1			$ 83,315			$ 95,428
Issuance of common stock and release of treasury stock for conversions of convertible debt, shares						1,195,496			400,144
Issuance of common stock and cash payment for special distribution	(82,122)			$ 2						332,732			(414,856)
Issuance of common stock for special distribution, shares				1,482,419
Accrued dividends on unvested equity awards	(9,531)												(9,531)
Change in redemption value of redeemable non-controlling interests	(90,913)									(90,913)
Purchase of redeemable non-controlling interests	(1,334)									17,977				(19,311)
Tax benefit from employee stock plans	18,561									18,561
Stock-based compensation, net of estimated forfeitures	117,522									117,522
Ending Balance at Dec. 31, 2014	$ 2,270,131			$ 57			$ (11,411)			3,334,305			(424,387)	(332,443)	(295,990)
Ending Balance, shares at Dec. 31, 2014	(56,451,255)			(56,505,122)			(53,867)
Net income (loss)	$ 187,774														187,774
Net (income) loss attributable to redeemable non-controlling interests	0
Other comprehensive loss	(176,616)													(176,616)
Issuance of common stock in public offering of common stock	829,496			$ 3						829,493
Issuance of common stock in public offering of common stock, shares				2,994,792
Other comprehensive (income) loss attributable to redeemable non-controlling interest	0
Issuance of common stock and release of treasury stock for employee equity awards	30,040			$ 1			$ 1,546			28,493
Issuance of common stock and release of treasury stock for employee equity awards, shares				856,406			7,348
Issuance of common stock and release of treasury stock for the exchanges and conversions of convertible debt		$ 7,884			$ 0			$ 2,492			$ 5,392
Issuance of common stock and release of treasury stock for the exchanges and conversions of convertible debt, debt					90,163			11,784
Dividend distributions	(393,584)												(393,584)
Settlement of accrued dividends on vested equity awards	3,775									3,775
Issuance of common stock and cash payment for special distribution	(125,707)			$ 1						501,513			(627,221)
Issuance of common stock for special distribution, shares				1,688,411
Accrued dividends on unvested equity awards	(23,280)												(23,280)
Tax benefit from employee stock plans	30									30
Stock-based compensation, net of estimated forfeitures	135,443									135,443
Ending Balance at Dec. 31, 2015	$ 2,745,386			$ 62			$ (7,373)			$ 4,838,444			$ (1,468,472)	$ (509,059)	$ (108,216)
Ending Balance, shares at Dec. 31, 2015	(62,100,159)			(62,134,894)			(34,735)