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Income Taxes - Loss Before Income Taxes in the US and Globally (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
US $ (286,211) $ (136,682) $ (140,354)
Foreign (37,865) (56,239) (35,821)
Loss before income taxes $ (324,076) $ (192,921) $ (176,175)