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Policyholder Liabilities (Reconciliation of Policyholders’ Account Balances to the Policyholders’ Account Balances’ Liability) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Policyholder Account Balance [Line Items]      
Policyholder account balance $ 60,980,242 $ 60,901,641  
Embedded derivative adjustment (548,478) (818,754)  
Policy benefit reserves 293,943 303,200  
Deferred profit liability 22,281 22,455  
Fixed Index Annuities      
Policyholder Account Balance [Line Items]      
Policyholder account balance 55,461,721 55,453,972 $ 53,826,234
Fixed Rate Annuities      
Policyholder Account Balance [Line Items]      
Policyholder account balance 5,726,033 5,913,965 $ 6,589,577
Other      
Policyholder Account Balance [Line Items]      
Policyholder account balance $ 24,742 $ 26,803