UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income		$ 1,720,391	$ 506,017	$ 2,896,223	$ 1,461,079
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	[1]	111,628	13,539	287,316	40,626
Net unrealized gain (loss) on marketable securities	[2]	(31,877)	173,365	501,034	36,868
Comprehensive income		$ 1,800,142	$ 692,921	$ 3,684,573	$ 1,538,573

[1] Foreign currency translation adjustments include tax benefits of $59,607 and $179,948 for the three and nine months ended September 30, 2017, respectively, and tax benefits of $12,867 and $47,023 for the three and nine months ended September 30, 2016, respectively, associated with net investment hedges (See Note 10). 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 9).

[2] Net of tax charges of $8,618 and $24,549 for the three and nine months ended September 30, 2017, respectively, and net of tax charges of $1,900 and $36,824 for the three and nine months ended September 30, 2016, respectively. Net unrealized gain (loss) on marketable securities includes net unrealized losses of $57,728 and net unrealized gains of $427,349 for the three and nine months ended September 30, 2017, respectively, compared to net unrealized gains of $167,673 and net unrealized losses of $74,885 for the three and nine months ended September 30, 2016, respectively, related to the Company's investments in Ctrip.com International Ltd. ("Ctrip"), which are exempt from tax in the Netherlands.