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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes |  |  |  |  |  |  |
Income tax provision (benefit) | $ (353) | $ (12) | $ (5,011) | $ (797) | $ 941 | $ (358) | $ 902
Effective tax rate | 9.00% | 0.60% | 24.20% | 3.60% | 7.80% | 1.00% | (1.20%)

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