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Income Taxes - Schedule of effective tax rate (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Taxes        
Earnings (loss) before provision (benefit) for income taxes $ 7,008 $ (3,733) $ 13,749 $ (15,016)
Provision (benefit) for income taxes $ 1,939 $ 2,136 $ 3,535 $ (1,426)
Effective tax rate 27.70% (57.20%) 25.70% 9.50%