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	181,970					181,970
Unrealized loss on marketable securities, net of tax benefit of $352	(774)	[1]					(774)
Currency translation adjustments, net of tax benefit of $12,962	37,244						37,244
Redeemable noncontrolling interests fair value adjustments	(52,214)					(52,214)
Reclassification adjustment for convertible debt in mezzanine	5,552				5,552
Exercise of stock options and vesting of restricted stock units and/or performance share units	1,045		3		1,042
Exercise of stock options and vesting of restricted stock units and/or performance share units (in shares)			393
Issuance of convertible senior notes	78,086				78,086
Repurchase of common stock	(254,225)			(254,225)
Repurchase of common stock (in shares)				(400)
Stock-based compensation and other stock-based payments	16,640				16,640
Excess tax benefit from stock-based compensation	4,040				4,040
Balance at Mar. 31, 2012	$ 2,591,659		$ 449	$ (1,057,811)	$ 2,536,639	$ 1,163,494	$ (51,112)
Balance (in shares) at Mar. 31, 2012			(57,972)	(8,180)

[1] Net of tax benefits of $352 and $206 for the three months ended March 31, 2012 and 2011, respectively.