CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total		Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
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	(9,257)
Increase (Decrease) in Stockholders' Equity
Net income	2,421,753					2,421,753
Foreign currency translation adjustments	(187,356)	[1]					(187,356)
Unrealized gain (loss) on marketable securities	(157,275)	[2]					(157,275)
Reclassification adjustment for convertible debt	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
Repurchase of common stock	(750,378)			$ (750,378)
Repurchase of common stock (in shares)				(631)
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
Issuance of senior convertible notes	80,873				80,873
Stock options and restricted stock units assumed in acquisitions	13,751				13,751
Excess tax benefits on stock-based awards and other equity deductions	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	(9,888)
Increase (Decrease) in Stockholders' Equity
Net income	2,551,360					2,551,360
Foreign currency translation adjustments	(114,505)	[1]					(114,505)
Unrealized gain (loss) on marketable securities	619,259	[2]					619,259
Reclassification adjustment for convertible debt	329				329
Exercise of stock options and vesting of restricted stock units and performance share units	20,851		$ 2		20,849
Exercise of stock options and vesting of restricted stock units and performance share units (in shares)			219
Repurchase of common stock	(3,089,055)			$ (3,089,055)
Repurchase of common stock (in shares)				(2,540)
Stock-based compensation and other stock-based payments	249,133				249,133
Conversion of debt	(110,105)				(110,105)
Excess tax benefits on stock-based awards and other equity deductions	101,508				101,508
Balance at Dec. 31, 2015	8,795,469		$ 482	$ (5,826,640)	5,184,910	9,191,865	244,852
Balance (in shares) at Dec. 31, 2015			62,040	(12,428)
Increase (Decrease) in Stockholders' Equity
Net income	2,134,987					2,134,987
Foreign currency translation adjustments	(93,984)	[1]					(93,984)
Unrealized gain (loss) on marketable securities	(285,552)	[2]					(285,552)
Reclassification adjustment for convertible debt	(28,538)				(28,538)
Exercise of stock options and vesting of restricted stock units and performance share units	15,572		$ 3		15,569
Exercise of stock options and vesting of restricted stock units and performance share units (in shares)			339
Repurchase of common stock	(1,028,524)			$ (1,028,524)
Repurchase of common stock (in shares)				(763)
Stock-based compensation and other stock-based payments	249,726				249,726
Excess tax benefits on stock-based awards and other equity deductions	60,986				60,986
Balance at Dec. 31, 2016	$ 9,820,142		$ 485	$ (6,855,164)	$ 5,482,653	$ 11,326,852	$ (134,684)
Balance (in shares) at Dec. 31, 2016			62,379	(13,191)

[1] Foreign currency translation adjustments includes a tax charge of $34,268, $60,418 and $55,597 for the years ended December 31, 2016, 2015 and 2014, respectively, associated with net investment hedges (See Note 12). The remaining balance in foreign currency translation adjustments excludes income taxes as a result of the Company's intention to indefinitely reinvest the earnings of its international subsidiaries outside of the United States (See Note 13).

[2] Net of a tax charge of $15,313 and $1,551 for the years ended December 31, 2016 and 2015, respectively, and net of a tax benefit of $7,621 for the year ended December 31, 2014.