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Statutory Requirements (Statutory Capital and Surplus) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Bermuda |  |
Statutory Accounting Practices [Line Items] |  |
Actual statutory capital and surplus | $ 3,375,317 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_BM | $ 3,194,446 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_BM
Required statutory capital and surplus | 479,346 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_BM | 562,126 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_BM
Restricted net assets | 1,018,878 us-gaap_OtherRestrictedAssets / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_BM | 887,083 us-gaap_OtherRestrictedAssets / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_BM
United Kingdom |  |
Statutory Accounting Practices [Line Items] |  |
Actual statutory capital and surplus | 409,046 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_GB | 380,336 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_GB
Required statutory capital and surplus | 409,046 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_GB | 380,336 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_GB
Restricted net assets | $ 0 us-gaap_OtherRestrictedAssets / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_GB | $ 0 us-gaap_OtherRestrictedAssets / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_GB

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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 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 210.7-03.23(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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph c -Article 7 + 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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