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Income Taxes - Income Before Income Tax, Domestic and Foreign (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Domestic $ (180,132) $ 51,018 $ 110,800
Foreign 223,478 285,243 512,677
Income before Income Taxes $ 43,346 $ 336,261 $ 623,477