UNAUDITED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - 9 months ended Sep. 30, 2017 - USD ($) $ 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			62,379,000	(13,191,000)
Increase (Decrease) in Stockholders' Equity
Net income	2,896,223					2,896,223
Foreign currency translation adjustments, net of tax benefit of $179,948	287,316	[1]					287,316
Net unrealized gain on marketable securities, net of tax charge of $24,549	501,034	[2]					501,034
Reclassification adjustment for convertible debt	19,137				19,137
Exercise of stock options and vesting of restricted stock units and performance share units	4,303		$ 1		4,302
Exercise of stock options and vesting of restricted stock units and/or performance share units (in shares)			150,000
Repurchase of common stock	$ (1,142,717)			$ (1,142,717)
Repurchase of common stock (in shares)	(632,006)			(632,000)
Stock-based compensation and other stock-based payments	$ 192,548				192,548
Stock Issued During Period, Shares, Conversion of Convertible Securities			46,000
Conversion of debt	(297)				(297)
Balance (in shares) at Sep. 30, 2017			62,575,000	(13,823,000)
Balance at Sep. 30, 2017	12,876,994		$ 486	$ (7,997,881)	5,707,331	14,513,392	$ 653,666
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 $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.