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Derivative Instruments (Fair Value of Derivative Instruments as Presented in the Consolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Derivative assets $ 1,509,892 $ 1,310,954
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative assets 1,509,892 1,310,954
Not Designated as Hedging Instrument | Call Options    
Derivatives, Fair Value [Line Items]    
Derivative assets 1,509,767 1,310,954
Not Designated as Hedging Instrument | Warrants    
Derivatives, Fair Value [Line Items]    
Derivative assets 125 0
Not Designated as Hedging Instrument | Fixed Index Annuities - Embedded Derivatives    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ 7,680,951 $ 7,938,281