CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total		Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Earnings	Accumulated Other Comprehensive Income (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			(57,579,000)	(7,780,000)
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	(620)	[1]					(620)
Currency translation adjustments, net of tax	64,526						64,526
Redeemable noncontrolling interests fair value adjustments	(84,693)				0	(84,693)
Reclassification adjustment for convertible debt in mezzanine	22,705				22,705
Exercise of stock options and vesting of restricted stock units and performance share units	2,683		4		2,679
Exercise of stock options and vesting of restricted stock units and performance share units (in shares)			477,000
Repurchase of common stock	(257,021)			(257,021)
Repurchase of common stock (in shares)				(405,000)
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			(58,056,000)	(8,185,000)
Increase (Decrease) in Stockholders' Equity
Net income applicable to common stockholders	1,892,663					1,892,663
Unrealized gain (loss) on marketable securities, net of tax benefit	21	[1]					21
Currency translation adjustments, net of tax	108,384						108,384
Redeemable noncontrolling interests fair value adjustments	(42,522)					(42,522)
Reclassification adjustment for convertible debt in mezzanine	46,122				46,122
Exercise of stock options and vesting of restricted stock units and performance share units	91,607		6		91,601
Exercise of stock options and vesting of restricted stock units and performance share units (in shares)			715,000
Repurchase of common stock	(883,515)			(883,515)
Repurchase of common stock (in shares)				(1,030,000)
Stock-based compensation and other stock-based payments	142,098				142,098
Conversion of debt	1,232		8		1,224
Conversion of debt (in shares)			972,000
Issuance of senior convertible notes	93,402				93,402
Common stock issued in an acquisition	1,281,134		12		1,281,122
Common stock issued in an acquisition (in shares)			1,522,000
Equity assumed in acquisition	264,423				264,423
Settlement of conversion spread hedges	(19)			(43,085)	(43,104)
Settlement of conversion spread hedges, shares				(42,000)
Excess tax benefit from stock-based compensation	17,686				17,686
Balance at Dec. 31, 2013	6,909,729		476	(1,987,207)	4,592,979	4,218,752	84,729
Balance (in shares) at Dec. 31, 2013			(61,265,000)	(9,257,000)
Increase (Decrease) in Stockholders' Equity
Net income applicable to common stockholders	2,421,753					2,421,753
Unrealized gain (loss) on marketable securities, net of tax benefit	(157,275)	[1]					(157,275)
Currency translation adjustments, net of tax	(187,356)						(187,356)
Redeemable noncontrolling interests fair value adjustments	0
Reclassification adjustment for convertible debt in mezzanine	8,204				8,204
Exercise of stock options and vesting of restricted stock units and performance share units	16,391		2		16,389
Exercise of stock options and vesting of restricted stock units and performance share units (in shares)			256,000
Repurchase of common stock	(750,378)			(750,378)
Repurchase of common stock (in shares)				(631,000)
Stock-based compensation and other stock-based payments	189,292				189,292
Conversion of debt	(1,656)		2		(1,658)
Conversion of debt (in shares)			300,000
Issuance of senior convertible notes	80,873				80,873
Equity assumed in acquisition	13,751				13,751
Excess tax benefit from stock-based compensation	23,366				23,366
Balance at Dec. 31, 2014	$ 8,566,694		$ 480	$ (2,737,585)	$ 4,923,196	$ 6,640,505	$ (259,902)
Balance (in shares) at Dec. 31, 2014			(61,821,000)	(9,888,000)

[1] Net of tax benefits of $7,621, $43 and $158 for the years ended December 31, 2014, 2013 and 2012, respectively.