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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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 | $ (181,426) | $ (109,101) | $ (83,747)
Increase (decrease) in valuation allowance | 17,865 | 22,655 | (9,934)
Tax reserves and interest | (3,468) | (12,679) | 166,347
State income taxes (benefit) | (19,802) | 1,087 | (10,000)
Total income tax expense (benefit) | $ (186,831) | $ (98,038) | $ 62,666
Effective tax rate (as a percent) | 15.60% | 22.90% | (10.40%)

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