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Derivative Investments (Balance Sheet) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 72,527 $ 114,287
Liability Derivatives [1] 88,109 133,236
Derivatives Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 72,527 114,287
Liability Derivatives 88,109 133,236
Derivatives Not Designated as Hedging Instruments [Member] | Equity Index Options [Member] | Derivatives, Index Options [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 72,527 114,287
Derivatives Not Designated as Hedging Instruments [Member] | Fixed-Index Products [Member] | Universal Life and Annuity Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives $ 88,109 $ 133,236
[1] Represents the fair value of certain product-related embedded derivatives that were recorded at fair value.