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Income Taxes - Income (loss) before income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
U.S. $ (1,029) $ (1,472) $ 4,634
Foreign 40,117 25,109 39,497
Income before income taxes $ 39,088 $ 23,637 $ 44,131