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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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 | $ 54,060 | $ 49,375 | $ (98,119)
Increase (decrease) in valuation allowance | 32,869 | 38,822 | 29,165
Impact of Tax Reform Act |  |  | 138,635
Tax reserves and interest | 1,107 | (10,626) | (148,615)
State income taxes (benefit) | 3,540 | 1,698 | (4,036)
Total income tax expense (benefit) | $ 91,576 | $ 79,269 | $ (82,970)
Effective tax rate (as a percent) | (15.50%) | (15.30%) | 14.30%
Effective income tax rate | 21.00% |  | 35.00%
Tax benefit from release of valuation allowance | $ 29,600 |  |
Tax dispute settlement amount | $ 14,400 |  |
Canada Drilling |  |  |
Reconciliation of the differences between taxes on income (loss) before income taxes |  |  |
Valuation allowance |  | $ 52,000 |
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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