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Derivative Instruments (Fair Value of Derivative Instruments as Presented in the Consolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Derivative assets $ 888,208 $ 205,149
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative assets 888,267 206,100
Derivative liabilities 9,281,998 8,165,405
Not Designated as Hedging Instrument | Call Options    
Derivatives, Fair Value [Line Items]    
Derivative assets 888,208 205,149
Not Designated as Hedging Instrument | Interest Rate Caps    
Derivatives, Fair Value [Line Items]    
Derivative assets 59 597
Not Designated as Hedging Instrument | Interest Rate Swap    
Derivatives, Fair Value [Line Items]    
Derivative assets 0 354
Derivative liabilities 881 0
Not Designated as Hedging Instrument | Fixed Index Annuities - Embedded Derivatives    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ 9,281,117 $ 8,165,405