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Policyholder Liabilities (Reconciliation of Market Risk Benefits in an Asset Position and in a Liability Position) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Market Risk Benefit [Line Items]      
Market risk benefits $ 479,694 $ 229,871 [1]  
MRB liability balance 3,146,554 2,455,492 [1]  
Net liability 2,666,860 2,225,621  
Fixed Index Annuities      
Market Risk Benefit [Line Items]      
Market risk benefits 477,306 226,294  
MRB liability balance 3,083,979 2,414,052  
Net liability 2,606,673 2,187,758 $ 2,557,378
Fixed Rate Annuities      
Market Risk Benefit [Line Items]      
Market risk benefits 2,388 3,577  
MRB liability balance 62,575 41,440  
Net liability $ 60,187 $ 37,863 $ 78,411
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.