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Policyholder Liabilities (Schedule of Reinsured Market Risk Benefits) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Fixed Rate Annuities    
Market Risk Benefit [Roll Forward]    
Balance, beginning of period $ 18,391 $ 10,656
Issuances 0 0
Interest accrual 274 775
Attributed fees collected 7 67
Benefits payments 0 0
Effect of changes in interest rates (634) 1,407
Effect of changes in equity markets 0 0
Effect of changes in equity index volatility 0 0
Effect of changes in future expected policyholder behavior 218 (128)
Effect of changes in other future expected assumptions 0 5,614
Balance, end of period 18,256 18,391
Net amount at risk (a) $ 75,941 $ 75,281
Weighted average attained age of contract holders (years) 70 years 70 years
Fixed Index Annuities    
Market Risk Benefit [Roll Forward]    
Balance, beginning of period $ 640,826 $ 593,959
Issuances 57 146,898
Interest accrual 9,527 33,503
Attributed fees collected 10,276 32,036
Benefits payments 0 0
Effect of changes in interest rates (42,876) 14,700
Effect of changes in equity markets (21,174) (22,775)
Effect of changes in equity index volatility 6,817 (18,656)
Effect of changes in future expected policyholder behavior 6,113 5,855
Effect of changes in other future expected assumptions 0 (144,694)
Balance, end of period 609,566 640,826
Net amount at risk (a) $ 2,877,855 $ 2,853,318
Weighted average attained age of contract holders (years) 70 years 70 years