Consolidated Statement of Redeemable Convertible Preferred Stock and Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock	Additional Paid-in Capital	Foreign Currency Translation Adjustments	Derivative Instruments	Unrealized Gains (Losses) on Available-for-sale Securities	Retained Earnings [Member]	Noncontrolling Interest	Redeemable Convertible Preferred Stock
Balance, value at Dec. 31, 2010	$ 2,444,994		$ 2,908	$ 5,581,525	$ 96,259	$ (282,774)	$ 7,537	$ (2,960,082)	$ (379)
Balance, (in shares) at Dec. 31, 2010			290,826,284
Redeemable preferred stock, shares at Dec. 31, 2010										6,361,000
4.5% Mandatory Convertible Preferred Stock, Shares Outstanding		0
Redeemable convertible preferred stock, value										305,032
Stock-based compensation related activity, net of forfeitures, value	34,167		10	34,157
Stock-based compensation related activity, net of forfeitures, shares			1,000,891
Purchases and retirement of capital stock, value	(303,414)		(74)	(303,340)					0
Net proceeds from issuance of preferred stock	0
Purchases and retirement of capital stock, shares			(7,377,803)
Purchases and retirement of preferred stock and losses on purchases of preferred stock, shares										(250,000)
Purchases and Retirement of Preferred Stock, and Losses on Purchases of Preferred Stock	(2,538)							(2,538)		(12,464)
Foreign currency translation adjustments	(848)				(1,215)				367
Available-for-sale securities
Unrealized gain (loss), net of tax	(7,537)						(7,537)
Derivative instruments:
Net change in fair value of cash flow hedging instruments, net of tax	(973)					(973)
Amounts reclassified into results of operations, net of tax	71,707					71,707
Dividends on preferred stock and amortization of issue costs, preferred stock										915
Dividends on preferred stock and amortization of issue costs, accumulated deficit	(20,402)							(20,402)
Acquisition of noncontrolling interest	248								248
Net income (loss)	171,460							171,077	383
Balance, value at Dec. 31, 2011	2,386,864	0	2,844	5,312,342	95,044	(212,040)	0	(2,811,945)	619
Redeemable preferred stock, shares at Dec. 31, 2011										6,111,000
Balance, (in shares) at Dec. 31, 2011			284,449,372
4.5% Mandatory Convertible Preferred Stock, Shares Outstanding	0	0
Redeemable convertible preferred stock, value										0
Stock-based compensation related activity, net of forfeitures, value	42,204		12	42,192
Stock-based compensation related activity, net of forfeitures, shares			1,129,579
Purchases and retirement of capital stock, value	(36,043)		(7)	(36,036)		0	0	0	0
Net proceeds from issuance of preferred stock	0
Purchases and retirement of capital stock, shares			(700,070)
Purchases and retirement of preferred stock and losses on purchases of preferred stock, shares										(6,111,000)
Purchases and Retirement of Preferred Stock, and Losses on Purchases of Preferred Stock	305,180		83	305,097						(305,180)
Stock Issued During Period, Shares, Conversion of Convertible Securities			8,285,905
Foreign currency translation adjustments	6,308				7,081				(773)
Available-for-sale securities
Unrealized gain (loss), net of tax	0
Derivative instruments:
Net change in fair value of cash flow hedging instruments, net of tax	0
Amounts reclassified into results of operations, net of tax	48,124					48,124
Dividends on preferred stock and amortization of issue costs, preferred stock										148
Dividends on preferred stock and amortization of issue costs, accumulated deficit	(2,629)							(2,629)
Acquisition of noncontrolling interest	368								368
Net income (loss)	200,888							188,584	12,304
Balance, value at Dec. 31, 2012	2,951,264	0	2,932	5,623,595	102,125	(163,916)	0	(2,625,990)	12,518
Redeemable preferred stock, shares at Dec. 31, 2012										0
Balance, (in shares) at Dec. 31, 2012	293,164,786		293,164,786
4.5% Mandatory Convertible Preferred Stock, Shares Outstanding	9,775,000	9,775,000
Redeemable convertible preferred stock, value										0
Stock-based compensation related activity, net of forfeitures, value	39,030		9	39,021
Stock-based compensation related activity, net of forfeitures, shares			934,691
Purchases and retirement of capital stock, value	(99,458)		(14)	(99,444)		0	0	0	0
Stock Issued During Period, Shares, New Issues		9,775,000	41,400,000
Net proceeds from issuance of preferred stock	950,886	98		950,788
Common Stock, Value, Issued	2,980,586		414	2,980,172	0	0	0	0	0
Purchases and retirement of capital stock, shares			(1,429,461)
Foreign currency translation adjustments	(45,714)				(43,864)				(1,850)
Available-for-sale securities
Unrealized gain (loss), net of tax	0
Derivative instruments:
Net change in fair value of cash flow hedging instruments, net of tax	0
Amounts reclassified into results of operations, net of tax	82,043					82,043
Dividends on preferred stock and amortization of issue costs, accumulated deficit	(11,363)			(11,363)
Net income (loss)	93,901							90,111	3,790
Balance, value at Dec. 31, 2013	$ 6,941,175	$ 98	$ 3,341	$ 9,482,769	$ 58,261	$ (81,873)	$ 0	$ (2,535,879)	$ 14,458
Redeemable preferred stock, shares at Dec. 31, 2013										0
Balance, (in shares) at Dec. 31, 2013	334,070,016		334,070,016