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Income Taxes - Domestic and Foreign Income Loss Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
U.S. $ (44,867) $ (47,205) $ 24,397
Foreign 461,631 323,805 901,565
Income before income taxes $ 416,764 $ 276,600 $ 925,962