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Income Taxes - Income Before Income Tax, Domestic and Foreign (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Domestic $ (132,138) $ (93,053) $ (180,132)
Foreign (53,695) 75,209 223,478
Income before Income Taxes $ (185,833) $ (17,844) $ 43,346