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Statutory Requirements (Statutory Net Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Bermuda |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Net (Loss) Income | $ (334,142) | $ 625,371 | $ 355,132
U.S. |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Net (Loss) Income | (3,627) | 43,292 | 58,752
U.K. |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory Net (Loss) Income | $ (57,050) | $ 28,007 | $ 1,627

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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