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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income taxes |  |  |  |
Effective tax rate (as a percent) | 26.00% | 20.00% | 14.30% | 22.50%
Decrease in tax benefit percentage |  |  | 0.30% |
Additional valuation allowance | $ 1,652 |  | $ 1,652 |
Reserve for uncertain tax positions |  | $ 819 |  |
Municipal Reporting Unit |  |  |  |
Income taxes |  |  |  |
Decrease in tax benefit percentage |  |  | 8.20% |

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