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	534,317					534,317
Unrealized loss on marketable securities, net of tax benefit of $345	(788)	[1]					(788)
Currency translation adjustments, net of tax of $10,735	(19,277)						(19,277)
Redeemable noncontrolling interests fair value adjustments	(43,440)					(43,440)
Reclassification adjustment for convertible debt in mezzanine	11,186				11,186
Exercise of stock options and vesting of restricted stock units and/or performance share units	1,693		4		1,689
Exercise of stock options and vesting of restricted stock units and/or performance share units (in shares)			428
Issuance of convertible senior notes	78,086				78,086
Repurchase of common stock	(255,168)			(255,168)
Repurchase of common stock (in shares)				(402)
Stock-based compensation and other stock-based payments	34,370				34,370
Excess tax benefit from stock-based compensation	12,513				12,513
Balance at Jun. 30, 2012	$ 2,927,787		$ 450	$ (1,058,754)	$ 2,569,123	$ 1,524,615	$ (107,647)
Balance (in shares) at Jun. 30, 2012			(58,007)	(8,182)

[1] Net of taxes of $7 and tax benefits of $345 for the three and six months ended June 30, 2012, respectively, and net of taxes of $102 and tax benefits of $104 for three and six months ended June 30, 2011, respectively.