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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 |  | $ (98,119) | $ (181,426) | $ (109,101)
Increase (decrease) in valuation allowance |  | 29,165 | 17,865 | 22,655
Impact of Tax Reform Act |  | 138,635 |  |
Tax reserves and interest |  | (148,615) | (3,468) | (12,679)
State income taxes (benefit) |  | (4,036) | (19,802) | 1,087
Total income tax expense (benefit) |  | $ (82,970) | $ (186,831) | $ (98,038)
Effective tax rate (as a percent) |  | 14.30% | 15.60% | 22.90%
Release of reserves due to favorable audit outcomes |  | $ 167,000 |  |
Effective income tax rate |  | 35.00% |  |
Provision to income tax expense |  | $ 138,600 |  |
Forecast |  |  |  |
Reconciliation of the differences between taxes on income (loss) before income taxes |  |  |  |
Effective income tax rate | 21.00% |  |  |
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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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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