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Derivative Instruments (Fair Value of Derivative Instruments as Presented in the Consolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Derivative assets $ 755,866 $ 205,149
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative assets 756,134 206,100
Derivative liabilities 8,876,150 8,165,405
Not Designated as Hedging Instrument | Call Options    
Derivatives, Fair Value [Line Items]    
Derivative assets 755,866 205,149
Not Designated as Hedging Instrument | Interest Rate Caps    
Derivatives, Fair Value [Line Items]    
Derivative assets 268 597
Not Designated as Hedging Instrument | Interest Rate Swap    
Derivatives, Fair Value [Line Items]    
Derivative assets 0 354
Derivative liabilities 95 0
Not Designated as Hedging Instrument | Fixed Index Annuities - Embedded Derivatives    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ 8,876,055 $ 8,165,405