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Income Taxes - Pre-Tax Income (Loss) by Jurisdiction (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Domestic operations $ (28,482) $ (12,852) $ 165
Foreign operations 54,648 20,140 25,023
Income before provision for income taxes $ 26,166 $ 7,288 $ 25,188