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Income Taxes - Income before provision (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income (loss) from operations before income taxes      
Income (loss) before income taxes $ 115,347 $ (312,290) $ 107,404
U.S.      
Income (loss) from operations before income taxes      
Income (loss) before income taxes 478,050 36,493 272,574
Non-U.S.      
Income (loss) from operations before income taxes      
Income (loss) before income taxes $ (362,703) $ (348,783) $ (165,170)