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Derivative Instruments (Fair Value of Derivative Instruments as Presented in the Consolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Derivative assets $ 205,149 $ 1,568,380
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative assets 206,100 1,568,795
Derivative liabilities 8,165,405 8,791,216
Not Designated as Hedging Instrument | Call Options    
Derivatives, Fair Value [Line Items]    
Derivative assets 205,149 1,568,380
Not Designated as Hedging Instrument | Interest Rate Caps    
Derivatives, Fair Value [Line Items]    
Derivative assets 597 415
Not Designated as Hedging Instrument | Interest Rate Swap    
Derivatives, Fair Value [Line Items]    
Derivative assets 354 0
Derivative liabilities 0 789
Not Designated as Hedging Instrument | Fixed Index Annuities - Embedded Derivatives    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ 8,165,405 $ 8,790,427