UNAUDITED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - 3 months ended Mar. 31, 2017 - 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, 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)
Increase (Decrease) in Stockholders' Equity
Net income	455,623					455,623
Foreign currency translation adjustments, net of tax benefit of $19,733	35,805	[1]					35,805
Unrealized gain on marketable securities, net of tax charge of $7,855	345,934	[2]					345,934
Reclassification adjustment for convertible debt	6,017				6,017
Exercise of stock options and vesting of restricted stock units and performance share units	1,479		$ 1		1,478
Exercise of stock options and vesting of restricted stock units and/or performance share units (in shares)			117
Repurchase of common stock	(212,344)			$ (212,344)
Repurchase of common stock (in shares)				(125)
Stock-based compensation and other stock-based payments	59,059				59,059
Conversion of debt	(1)				(1)
Balance (in shares) at Mar. 31, 2017			62,496	(13,316)
Balance at Mar. 31, 2017	10,811,019		$ 486	$ (7,067,508)	5,558,194	12,072,792	$ 247,055
Increase (Decrease) in Stockholders' Equity
Cumulative effect of adoption of accounting standard updates	$ 299,305				$ 8,988	$ 290,317

[1] Foreign currency translation adjustments include a tax benefit of $19,733 and $61,096 for the three months ended March 31, 2017 and 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 a tax charge of $7,855 and $29,128 for the three months ended March 31, 2017 and 2016, respectively. Unrealized gain (loss) on marketable securities includes a net unrealized gain of $323,688 for the three months ended March 31, 2017, compared to a net unrealized loss of $113,152 for three months ended March 31, 2016 on the Company's investments in Ctrip.com International Ltd. ("Ctrip"), which were exempt from tax in the Netherlands.