UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income		$ 580,638	$ 517,032	$ 955,062	$ 850,359
Other comprehensive income, net of tax
Foreign currency translation adjustments	[1]	(50,285)	56,983	27,087	(70,028)
Unrealized (loss) gain on marketable securities	[2]	(112,038)	124,439	(136,497)	286,807
Comprehensive income		$ 418,315	$ 698,454	$ 845,652	$ 1,067,138

[1] (1) Foreign currency translation adjustments include a tax charge of $26,940 and a tax benefit of $34,156 for the three and six months ended June 30, 2016, respectively, and a tax benefit of $34,586 and a tax charge of $42,019 for the three and six months ended June 30, 2015, respectively, associated with net investment hedges (See Note 10). The remaining balance in foreign currency translation adjustments excludes income taxes due to the Company's practice and intention to indefinitely reinvest the earnings of its international subsidiaries outside of the United States (See Note 9).

[2] Net of tax charges of $5,796 and $34,924 for the three and six months ended June 30, 2016, respectively, and net of tax benefits of $11,596 and $1,620 for the three and six months ended June 30, 2015, respectively.