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Derivative Instruments (Fair Value of Derivative Instruments as Presented in the Consolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Derivative assets $ 874,741 $ 1,355,989
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative assets 874,741 1,355,995
Not Designated as Hedging Instrument | Call Options    
Derivatives, Fair Value [Line Items]    
Derivative assets 874,741 1,355,989
Not Designated as Hedging Instrument | Interest Rate Caps    
Derivatives, Fair Value [Line Items]    
Derivative assets 0 6
Not Designated as Hedging Instrument | Fixed Index Annuities - Embedded Derivatives    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ 7,475,216 $ 9,624,395