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Derivative Instruments (Notional and Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Derivatives, Fair Value [Line Items]    
Derivative assets $ 1,617,000 $ 1,207,288
Call Options    
Derivatives, Fair Value [Line Items]    
Notional amount 41,614,193 41,547,731
Derivative assets 1,617,000 1,207,288
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Notional amount 41,614,193 41,547,731
Derivative assets 1,617,000 1,207,288
Derivative liabilities 4,975,153 4,925,118
Not Designated as Hedging Instrument | Call Options    
Derivatives, Fair Value [Line Items]    
Notional amount 41,614,193 41,547,731
Derivative assets 1,617,000 1,207,288
Not Designated as Hedging Instrument | Fixed index annuities - embedded derivatives    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 5,273,407 5,181,894
Not Designated as Hedging Instrument | Reinsurance Related Embedded Derivative    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ (298,254) $ (256,776)