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Income Taxes - Schedule of effective tax rate (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Taxes        
Earnings (loss) before provision (benefit) for income taxes $ (3,733) $ 8,614 $ (15,016) $ 15,758
Income tax provision (benefit) $ 2,136 $ 2,029 $ (1,426) $ 3,691
Effective tax rate (57.20%) 23.60% 9.50% 23.40%