UNAUDITED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total		Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Earnings	Accumulated Other Comprehensive Loss
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	1,130,903					1,130,903
Unrealized loss on marketable securities, net of tax benefit of $167	(544)	[1]					(544)
Currency translation adjustments, net of taxes of $2,770	25,254						25,254
Redeemable noncontrolling interests fair value adjustments	(59,255)					(59,255)
Reclassification adjustment for convertible debt in mezzanine	16,903				16,903
Exercise of stock options and vesting of restricted stock units and/or performance share units	2,655		4		2,651
Exercise of stock options and vesting of restricted stock units and/or performance share units (in shares)			468
Issuance of convertible senior notes	78,097				78,097
Repurchase of common stock	(255,397)			(255,397)
Repurchase of common stock (in shares)				(402)
Stock-based compensation and other stock-based payments	52,042				52,042
Excess tax benefit from stock-based compensation	12,911				12,911
Balance at Sep. 30, 2012	$ 3,577,864		$ 450	$ (1,058,983)	$ 2,593,883	$ 2,105,386	$ (62,872)
Balance (in shares) at Sep. 30, 2012			(58,047)	(8,182)

[1] Net of taxes of $178 and tax benefit of $167 for the three and nine months ended September 30, 2012, respectively, and net of taxes of $216 and $112 for three and nine months ended September 30, 2011, respectively.