UNAUDITED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - 3 months ended Mar. 31, 2015 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Earnings	Accumulated Other Comprehensive Loss
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	(9,888)
Increase (Decrease) in Stockholders' Equity
Net income applicable to common stockholders	333,327				333,327
Foreign currency translation adjustments, net of tax of $76,605	(127,011)					(127,011)
Unrealized gain on marketable securities, net of tax of $9,976	162,368					162,368
Reclassification adjustment for convertible debt in mezzanine	329			329
Exercise of stock options and vesting of restricted stock units and performance share units	9,070	$ 1		9,069
Exercise of stock options and vesting of restricted stock units and/or performance share units (in shares)		153
Repurchase of common stock	(308,618)		$ (308,618)
Repurchase of common stock (in shares)			(251)
Stock-based compensation and other stock-based payments	54,533			54,533
Conversion of debt	(110,105)	$ 0		(110,105)
Conversion of debt (in shares)		0
Excess tax benefits on stock-based compensation	49,538			49,538
Balance (in shares) at Mar. 31, 2015		61,974	(10,139)
Balance at Mar. 31, 2015	$ 8,630,125	$ 481	$ (3,046,203)	$ 4,926,560	$ 6,973,832	$ (224,545)