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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Market Risk Benefit [Line Items]      
MRB asset balance $ 230,304 $ 229,871 [1]  
MRB liability balance 2,653,185 2,455,492 [1]  
Net Liability 2,422,881 2,225,621  
Fixed Index Annuities      
Market Risk Benefit [Line Items]      
MRB asset balance 226,747 226,294  
MRB liability balance 2,608,472 2,414,052  
Net Liability 2,381,725 2,187,758 $ 2,557,379
Fixed Rate Annuities      
Market Risk Benefit [Line Items]      
MRB asset balance 3,557 3,577  
MRB liability balance 44,713 41,440  
Net Liability $ 41,156 $ 37,863 $ 78,411
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.