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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income Taxes |  |  |  |
Provisional income tax expense | $ 25,333 | $ 19,891 | $ 45,069 | $ 35,823
Effective tax rate (as a percent) |  |  | 18.60% | 17.00%
Federal statutory tax rate (as a percent) |  |  | 21.00% |

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