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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income taxes |  |  |  |
Effective tax rate (as a percent) | 14.60% | 26.00% | 8.20% | 14.30%
Discrete tax benefit | $ 774 |  | $ 3,513 |
Decrease in tax benefit percentage |  |  |  | 0.30%
Additional valuation allowance |  | $ 1,652 |  | $ 1,652
Municipal Reporting Unit |  |  |  |
Income taxes |  |  |  |
Decrease in tax benefit percentage |  |  |  | 8.20%

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to discrete tax benefit. + References No definition available. + Details
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