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

X

- 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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X

- 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

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X

- 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

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