Consolidated Statement of Redeemable Convertible Preferred Stock and Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Foreign Currency Translation Adjustments	Derivative Instruments	Unrealized Gains (Losses) on Available-for-sale Securities	Accumulated Deficit	Noncontrolling Interest	Redeemable Convertible Preferred Stock
Balance, value at Dec. 31, 2009	$ 2,936,085	$ 2,927	$ 5,685,874	$ 68,447	$ (199,470)	$ 6,799	$ (2,628,336)	$ (156)
Balance, (in shares) at Dec. 31, 2009		292,729,684
Redeemable preferred stock, shares at Dec. 31, 2009									6,361,000
Redeemable convertible preferred stock, value									316,581
Stock-based compensation related activity, net of forfeitures, value	55,271	22	55,249
Stock-based compensation related activity, net of forfeitures, shares		2,230,458
Purchases and retirement of capital stock, value	(159,639)	(41)	(159,598)					0
Purchases and retirement of capital stock, shares		(4,133,858)
Foreign currency translation adjustments	27,908			27,812				96
Available-for-sale securities:
Unrealized gain (loss), net of tax	738					738
Derivative instruments:
Net change in fair value of cash flow hedging instruments, net of tax	(140,194)				(140,194)
Amounts reclassified into results of operations, net of tax	56,890				56,890
Dividends on preferred stock and amortization of issue costs, preferred stock									927
Dividends on preferred stock and amortization of issue costs, accumulated deficit	(20,806)						(20,806)
Net income (loss)	(311,259)						(310,940)	(319)
Balance, value at Dec. 31, 2010	2,444,994	2,908	5,581,525	96,259	(282,774)	7,537	(2,960,082)	(379)
Redeemable preferred stock, shares at Dec. 31, 2010									6,361,000
Balance, (in shares) at Dec. 31, 2010		290,826,284
Redeemable convertible preferred stock, value	305,032								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	0	0	0
Purchases and retirement of capital stock, shares		(7,377,803)
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	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								6,111,000
Balance, (in shares) at Dec. 31, 2011	284,449,372	284,449,372
Redeemable convertible preferred stock, value	0								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)
Purchases and retirement of capital stock, shares		(700,070)
Purchases and retirement of preferred stock and losses on purchases of preferred stock, value	305,180						0		(305,180)
Purchases and retirement of preferred stock and losses on purchases of preferred stock, shares									(6,111,000)
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)
Disposition of noncontrolling interest	368							368
Net income (loss)	200,888						188,584	12,304
Balance, value at Dec. 31, 2012	$ 2,951,264	$ 2,932	$ 5,623,595	$ 102,125	$ (163,916)	$ 0	$ (2,625,990)	$ 12,518
Redeemable preferred stock, shares at Dec. 31, 2012	0								0
Balance, (in shares) at Dec. 31, 2012	293,164,786	293,164,786