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Derivative Instruments (Fair Value of Derivative Instruments as Presented in the Consolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Derivative assets $ 1,568,380 $ 830,519
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 1,568,795 831,601
Derivative liabilities 8,791,216 6,565,401
Not Designated as Hedging Instrument [Member] | Call Options [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 1,568,380 830,519
Not Designated as Hedging Instrument [Member] | Interest Rate Caps [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 415 1,082
Not Designated as Hedging Instrument [Member] | Fixed Index Annuities - Embedded Derivatives [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 8,790,427 6,563,288
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ 789 $ 2,113