Certain Nontraditional Long-Duration Contracts (Summary of the Changes in General Account Liabilities for Guarantees on Variable Contracts) (Details) (variableannuity, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Net Amount At Risk By Product And Guarantee [Line Items]
GuaranteedBenefitLiabilityGross, Beginning Balance	$ 2,039,178		$ 1,975,689		$ 308,149
Impact of assumption and experience unlocking and true-ups	(74,125)	[1]	45,603	[1]	23,648	[1]
Incurred guarantee benefits	(955,628)	[1]	49,999	[1]	1,680,244	[1]
GuaranteedBenefitsPaid	(28,254)		(32,113)		(36,352)
GuaranteedBenefitLiabilityGross, Ending Balance	989,372		2,039,178		1,975,689
Changes in Unrealized Investment Gains and Losses	8,201
GuaranteedMinimumAccumulationWithdrawalIncomeAndWithdrawalBenefitsMember [Member]
Net Amount At Risk By Product And Guarantee [Line Items]
GuaranteedBenefitLiabilityGross, Beginning Balance	1,793,135		1,783,594		164,282
Impact of assumption and experience unlocking and true-ups	0	[1]	0	[1]	0	[1]
Incurred guarantee benefits	(1,014,909)	[1]	9,541	[1]	1,619,312	[1]
GuaranteedBenefitsPaid	0		0		0
GuaranteedBenefitLiabilityGross, Ending Balance	778,226		1,793,135		1,783,594
Changes in Unrealized Investment Gains and Losses	0
GuaranteedMinimumIncomeBenefitMember
Net Amount At Risk By Product And Guarantee [Line Items]
GuaranteedBenefitLiabilityGross, Beginning Balance	23,516		14,377		13,377
Impact of assumption and experience unlocking and true-ups	(14,050)	[1]	6,948	[1]	570	[1]
Incurred guarantee benefits	2,400	[1]	2,873	[1]	504	[1]
GuaranteedBenefitsPaid	(747)		(682)		(74)
GuaranteedBenefitLiabilityGross, Ending Balance	11,279		23,516		14,377
Changes in Unrealized Investment Gains and Losses	160
GuaranteedMinimumDeathBenefitMember
Net Amount At Risk By Product And Guarantee [Line Items]
GuaranteedBenefitLiabilityGross, Beginning Balance	222,527		177,718		130,490
Impact of assumption and experience unlocking and true-ups	(60,075)	[1]	38,655	[1]	23,078	[1]
Incurred guarantee benefits	56,884	[1]	37,585	[1]	60,428	[1]
GuaranteedBenefitsPaid	(27,507)		(31,431)		(36,278)
GuaranteedBenefitLiabilityGross, Ending Balance	199,870		222,527		177,718
Changes in Unrealized Investment Gains and Losses	$ 8,041

[1] Incurred guarantee benefits include the portion of assessments established as additions to reserve as well as changes in estimates affecting the reserves. Also includes changes in the fair value of features accounted for as derivatives.