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Policyholder Liabilities (Schedule of Present Value of Expected Future Policy Benefits) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance, liability for future policy benefits $ 318,677 $ 402,305  
Beginning balance at original discount rate 342,453 352,708  
Effect of changes in cash flow assumptions   (4,607) $ 1,277
Effect of actual variances from expected experience   (1,692) (1,941)
Adjusted beginning of year balance   336,154 $ 352,044
Issuances 6,391 16,072  
Interest accrual 10,357 14,664  
Derecognition (lapses and benefit payments) (29,252) (40,327)  
Ending balance at original discount rate 323,650 342,453  
Effect of changes in discount rate assumptions (31,316) (23,776)  
Ending balance, liability for future policy benefits $ 292,334 $ 318,677