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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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 | $ 62,751 | $ 54,060 | $ 49,375
Increase (decrease) in valuation allowance | (9,759) | 32,869 | 38,822
Tax reserves and interest | 861 | 1,107 | (10,626)
State income taxes (benefit) | 3,433 | 3,540 | 1,698
Total income tax expense (benefit) | $ 57,286 | $ 91,576 | $ 79,269
Effective tax rate (as a percent) | (8.10%) | (15.50%) | (15.30%)
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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