Deferred Policy Acquisition Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
DeferredPolicyAcquisitionCostsDisclosuresAbstract
Balance, beginning of year	$ 1,345,504us-gaap_DeferredPolicyAcquisitionCosts	$ 906,814us-gaap_DeferredPolicyAcquisitionCosts	$ 666,764us-gaap_DeferredPolicyAcquisitionCosts
DeferredPolicyAcquisitionCostsAdditions	2,804	4,050	25,081
Amortization Impact Of Assumption And Experience Unlocking And True Ups	91,895	31,666	274,503
Amortization - All Other	(330,311)	353,895	(86,461)
DeferredPolicyAcquisitionCostAmortizationExpenseUnrealizedInvestmentGainsLosses	4,539	49,079	26,927
Balance, end of year	$ 1,114,431us-gaap_DeferredPolicyAcquisitionCosts	$ 1,345,504us-gaap_DeferredPolicyAcquisitionCosts	$ 906,814us-gaap_DeferredPolicyAcquisitionCosts

Amortization Impact Of Assumption And Experience Unlocking And True Ups

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- Definition

Amount of other increase (decrease) to amortization expense of deferred policy acquisition cost (DAC).

+ References

No definition available.

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- Definition

Amount of increase (decrease) in deferred policy acquisition cost (DAC) due to unrealized investment gain (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 30

-Section 50

-Paragraph 1

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-Section 35

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- Definition

Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 16

-Article 12

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- Definition

Total amount of policy acquisition costs capitalized during the income statement period.

+ References

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