CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total		Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Earnings (Deficit)	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2009	$ 1,321,629		$ 405	$ (510,970)	$ 2,289,867	$ (454,673)	$ (3,000)
Balance (in shares) at Dec. 31, 2009			(52,446)	(6,865)
Increase (Decrease) in Stockholders' Equity
Net income applicable to common stockholders	527,541					527,541
Unrealized gain (loss) on marketable securities, net of tax benefit of $158 in 2012 and tax of $96, and $175 in 2011 and 2010, respectively	294	[1]					294
Currency translation adjustment, net of tax benefit of $18,001 in 2012 and tax of $21,547, and $11,311 in 2011, and 2010, respectively	(30,183)						(30,183)
Redeemable noncontrolling interests fair value adjustment	(7,876)				(4,118)	(3,758)
Proceeds from the termination of conversion spread hedges	42,984				42,984
Reclassification adjustment for convertible debt in mezzanine	3,683				3,683
Exercise of stock options and vesting of restricted stock units and/or performance share units	25,751		5		25,746
Exercise of stock options and vesting of restricted stock units and performance share units (in shares)			663
Repurchase of common stock	(129,445)			(129,445)
Repurchase of common stock (in shares)				(556)
Stock-based compensation and other stock based payments	68,396				68,396
Issuance of senior convertible notes	67,516				67,516
Conversion of debt	(80,045)		28		(80,073)
Conversion of debt (in shares)			3,458
Excess tax benefit from stock-based compensation	3,091				3,091
Balance at Dec. 31, 2010	1,813,336		438	(640,415)	2,417,092	69,110	(32,889)
Balance (in shares) at Dec. 31, 2010			(56,567)	(7,421)
Increase (Decrease) in Stockholders' Equity
Net income applicable to common stockholders	1,056,371					1,056,371
Unrealized gain (loss) on marketable securities, net of tax benefit of $158 in 2012 and tax of $96, and $175 in 2011 and 2010, respectively	212	[1]					212
Currency translation adjustment, net of tax benefit of $18,001 in 2012 and tax of $21,547, and $11,311 in 2011, and 2010, respectively	(54,905)						(54,905)
Redeemable noncontrolling interests fair value adjustment	(91,743)					(91,743)
Reclassification adjustment for convertible debt in mezzanine	(77,342)				(77,342)
Exercise of stock options and vesting of restricted stock units and/or performance share units	4,302		8		4,294
Exercise of stock options and vesting of restricted stock units and performance share units (in shares)			1,007
Repurchase of common stock	(163,171)			(163,171)
Repurchase of common stock (in shares)				(359)
Stock-based compensation and other stock based payments	66,194				66,194
Conversion of debt	0
Conversion of debt (in shares)			5
Excess tax benefit from stock-based compensation	21,041				21,041
Balance at Dec. 31, 2011	2,574,295		446	(803,586)	2,431,279	1,033,738	(87,582)
Balance (in shares) at Dec. 31, 2011			(57,579)	(7,780)
Increase (Decrease) in Stockholders' Equity
Net income applicable to common stockholders	1,419,566					1,419,566
Unrealized gain (loss) on marketable securities, net of tax benefit of $158 in 2012 and tax of $96, and $175 in 2011 and 2010, respectively	(620)	[1]					(620)
Currency translation adjustment, net of tax benefit of $18,001 in 2012 and tax of $21,547, and $11,311 in 2011, and 2010, respectively	64,526						64,526
Redeemable noncontrolling interests fair value adjustment	(84,693)					(84,693)
Reclassification adjustment for convertible debt in mezzanine	22,705				22,705
Exercise of stock options and vesting of restricted stock units and/or performance share units	2,683		4		2,679
Exercise of stock options and vesting of restricted stock units and performance share units (in shares)			477
Repurchase of common stock	(257,021)			(257,021)
Repurchase of common stock (in shares)				(405)
Stock-based compensation and other stock based payments	72,035				72,035
Issuance of senior convertible notes	78,310				78,310
Excess tax benefit from stock-based compensation	5,189				5,189
Balance at Dec. 31, 2012	$ 3,896,975		$ 450	$ (1,060,607)	$ 2,612,197	$ 2,368,611	$ (23,676)
Balance (in shares) at Dec. 31, 2012			(58,056)	(8,185)

[1] Net of tax benefits of $158 for the year ended December 31, 2012 and taxes of $96 and $175 for the years ended December 31, 2011, and 2010, respectively.