CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income		$ 2,134,987	$ 2,551,360	$ 2,421,753
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	[1]	(93,984)	(114,505)	(187,356)
Unrealized gain (loss) on marketable securities	[2]	(285,552)	619,259	(157,275)
Comprehensive income		1,755,451	3,056,114	2,077,122
Currency translation adjustment, tax (benefit)		34,268	60,418	55,597
Unrealized gain (loss) on marketable securities, tax (benefit)		$ 15,313	$ 1,551	$ (7,621)

[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.