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Statutory Requirements (Statutory Net Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	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.

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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

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