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Income Taxes - Pre-Tax Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
US $ (47,574) $ (36,202) $ (13,355)
Non US 138,365 161,784 116,715
Total $ 90,791 $ 125,582 $ 103,360