Certain Nontraditional Long-Duration Contracts (Guarantees Associated with Variable Annuity Contracts, by guarantee, by Guarantee Type) (MVA Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Unadjusted Value
Net Amount At Risk By Product And Guarantee [Line Items]
MVA Account Value	$ 1,554,743	$ 2,182,791
Adjusted Value
Net Amount At Risk By Product And Guarantee [Line Items]
MVA Account Value	$ 1,580,487	$ 2,277,200