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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of the differences between taxes on income (loss) before income taxes |  |  |
Taxes (benefit) on U.S. and other international earnings (losses) at greater than the Bermuda rate | $ 23,395 | $ 62,751 | $ 54,060
Increase (decrease) in valuation allowance | 8,276 | (9,759) | 32,869
Tax reserves and interest | 26,266 | 861 | 1,107
State income taxes (benefit) | (2,316) | 3,433 | 3,540
Total income tax expense (benefit) | $ 55,621 | $ 57,286 | $ 91,576
Effective tax rate (as a percent) | (11.40%) | (8.10%) | (15.50%)
Increase in tax expense attributable to a recorded liability for uncertain tax positions | $ 26,300 |  |
Office of the Tax Commissioner, Bermuda |  |  |
Reconciliation of the differences between taxes on income (loss) before income taxes |  |  |
Effective income tax rate | 0.00% |  |

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