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Statutory Requirements (Statutory Capital and Surplus) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Bermuda |  |
Statutory Accounting Practices [Line Items] |  |
Actual statutory capital and surplus | $ 4,212,787 | $ 4,878,811
Required statutory capital and surplus | 807,108 | 1,782,778
Restricted net assets | 1,779,319 | 838,633
U.S. |  |
Statutory Accounting Practices [Line Items] |  |
Actual statutory capital and surplus | 523,340 | 521,522
Required statutory capital and surplus | 221,023 | 219,164
Restricted net assets | 324,567 | 321,362
U.K. |  |
Statutory Accounting Practices [Line Items] |  |
Actual statutory capital and surplus | 491,213 | 485,256
Required statutory capital and surplus | 491,213 | 485,256
Restricted net assets | $ 0 | $ 0

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- Definition Total assets that cannot be used for operating purposes because of contract or regulatory requirements that are in effect for a period that extends beyond one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 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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