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Income Taxes - Summary of income before income taxes by geographical area (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes      
Federal $ 46,445 $ 48,393 $ 33,830
Foreign 3,997 (5,325) (9,190)
Income before provision for income taxes $ 50,442 $ 43,068 $ 24,640