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Policyholder Liabilities (Reconciliation of Market Risk Benefits in an Asset Position and in a Liability Position) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Market Risk Benefit [Line Items]      
MRB asset balance $ 524,598 $ 479,694  
MRB liability balance 3,122,918 3,146,554  
Net liability 2,598,320 2,666,860  
Fixed Index Annuities      
Market Risk Benefit [Line Items]      
MRB asset balance 522,323 477,306  
MRB liability balance 3,061,544 3,083,979  
Net liability 2,539,221 2,606,673 $ 2,187,758
Fixed Rate Annuities      
Market Risk Benefit [Line Items]      
MRB asset balance 2,275 2,388  
MRB liability balance 61,374 62,575  
Net liability $ 59,099 $ 60,187 $ 37,863