Reinsurance (Effect of Reinsurance on Net Premiums and Claims and Other Policy Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Premiums Earned, Net [Abstract]
Direct Premiums Earned	$ 19,365us-gaap_DirectPremiumsEarned	$ 5,224us-gaap_DirectPremiumsEarned	$ 3,784us-gaap_DirectPremiumsEarned
Assumed Premiums Earned	9,098,378us-gaap_AssumedPremiumsEarned	8,568,222us-gaap_AssumedPremiumsEarned	8,228,811us-gaap_AssumedPremiumsEarned
Ceded Premiums Earned	(447,889)us-gaap_CededPremiumsEarned	(319,419)us-gaap_CededPremiumsEarned	(325,999)us-gaap_CededPremiumsEarned
Net premiums	8,669,854us-gaap_PremiumsEarnedNet	8,254,027us-gaap_PremiumsEarnedNet	7,906,596us-gaap_PremiumsEarnedNet
Policyholder Benefits and Claims Incurred, Net [Abstract]
Policyholder Benefits and Claims Incurred, Direct	32,564	8,078	3,694
Policyholder Benefits and Claims Incurred, Assumed	7,805,984	7,515,524	6,912,942
Policyholder Benefits and Claims Incurred, Ceded	(431,907)	(219,270)	(250,637)
Claims and other policy benefits	$ 7,406,641	$ 7,304,332	$ 6,665,999

Amount of earned premiums assumed from other entities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of earned premiums ceded to other entities.

+ References

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- Definition

Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 235

-Section S99

-Paragraph 2

-Subparagraph (SX 210.12-17)

-URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Amount, before effect of policies assumed or ceded, of expense related to provision for policy benefits and costs incurred.

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Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred.

+ References

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of policy benefits and costs incurred for policies assumed.

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Amount of reduction of provision for policy benefits and costs incurred for policies ceded.

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