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Statutory Requirements (Statutory Capital and Surplus) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Bermuda |  |
Statutory Accounting Practices [Line Items] |  |
Statutory capital and surplus | $ 4,155,440 | $ 4,212,374
Required statutory capital and surplus | 824,545 | 788,437
Unrestricted net assets | 790,177 | 867,624
U.S. |  |
Statutory Accounting Practices [Line Items] |  |
Statutory capital and surplus | 523,384 | 523,340
Required statutory capital and surplus | 306,375 | 221,023
Unrestricted net assets | 24,109 | 25,375
U.K. |  |
Statutory Accounting Practices [Line Items] |  |
Statutory capital and surplus | 527,325 | 491,213
Required statutory capital and surplus | 527,325 | 491,213
Unrestricted net assets | $ 0 | $ 0

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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 dividends that can be declared or paid without approval of regulatory agency. + References Reference 1: 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.(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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- Definition Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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