UNAUDITED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - 6 months ended Jun. 30, 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	1,175,832					1,175,832
Foreign currency translation adjustments, net of tax benefit of $120,341	175,688	[1]					175,688
Net unrealized gain on marketable securities, net of tax charge of $15,931	532,911	[2]					532,911
Reclassification adjustment for convertible debt	13,461				13,461
Exercise of stock options and vesting of restricted stock units and performance share units	2,790		$ 1		2,789
Exercise of stock options and vesting of restricted stock units and/or performance share units (in shares)			138
Repurchase of common stock	(556,228)			$ (556,228)
Repurchase of common stock (in shares)				(312)
Stock-based compensation and other stock-based payments	126,047				126,047
Stock Issued During Period, Shares, Conversion of Convertible Securities			43
Conversion of debt	(279)				(279)
Balance (in shares) at Jun. 30, 2017			62,560	(13,503)
Balance at Jun. 30, 2017	11,589,669		$ 486	$ (7,411,392)	5,633,659	12,793,001	$ 573,915
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 tax benefits of $100,608 and $120,341 for the three and six months ended June 30, 2017, respectively, and a tax charge of $26,940 and a tax benefit of $34,156 for the three and six months ended June 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 $8,076 and $15,931 for the three and six months ended June 30, 2017, respectively, and net of tax charges of $5,796 and $34,924 for the three and six months ended June 30, 2016, respectively. Net unrealized gain (loss) on marketable securities includes net unrealized gains of $161,389 and $485,077 for the three and six months ended June 30, 2017, respectively, compared to net unrealized losses of $129,406 and $242,558 for the three and six months ended June 30, 2016, respectively, related to the Company's investments in Ctrip.com International Ltd. ("Ctrip"), which are exempt from tax in the Netherlands.