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Income Taxes - Schedule of Statutory Federal Income Tax Rate to Income from Continuing Operations Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Income tax expense at the federal statutory rate of 35% $ 145,867 $ 96,810 $ 324,087
Foreign tax rate differential (81,509) (66,947) (162,784)
Unrecognized tax benefits and related interest 27,690 33,170 33,362
Change in valuation allowance 3,686 (13,924) 27,320
Return to provision true-ups 686 (14,420) (8,875)
Pay-to-play penalties 0 0 (11,222)
Acquisition related costs 1,554 1,611 12,545
Federal research and development credit (16,000) (15,000) (11,500)
trivago stock-based-compensation 5,011 16,956 0
Excess tax benefits related to stock-based compensation (59,668) (39,751) 0
Tax Act transition tax 144,167 0 0
U.S. statutory tax rate change (158,286) 0 0
Other, net 32,207 16,810 281
Income tax expense $ 45,405 $ 15,315 $ 203,214