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Income Taxes - Components of income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of income before taxes      
Pre-IPO Domestic   $ 13,370 $ 65,023
Post-IPO Domestic $ 173,039 146,620  
Pre-IPO Foreign   512 3,073
Post-IPO Foreign 15,284 9,299  
Income before income taxes $ 188,323 $ 169,801 $ 68,096