Deferred Policy Acquisition Costs (Rollforward) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
DeferredPolicyAcquisitionCostsDisclosures[Abstract]      
Balance, beginning of year $ 3,679,061 $ 2,545,600 $ 2,693,689
DeferredPolicyAcquisitionCostsAdditions 822,075 1,171,759 1,096,301
Amortization-Impact of assumption and experience unlocking and true-ups (9,167) 60,313 (25,242)
Amortization - All Other 533,478 (21,345) (947,961)
DeferredPolicyAcquisitionCostAmortizationExpenseUnrealizedInvestmentGainsLosses 167,880 (53,651) 9,973
Ceded DAC (159,028) (23,616) (281,160)
Balance, end of year $ 5,034,299 $ 3,679,061 $ 2,545,600