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Policyholder Liabilities (Schedule of Present Value of Expected Future Policy Benefits) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance, liability for future policy benefits $ 303,200 $ 318,677  
Beginning balance at original discount rate 317,634 342,453  
Effect of changes in cash flow assumptions   0 $ (4,607)
Effect of actual variances from expected experience   (102) (1,887)
Adjusted beginning of year balance   317,532 $ 335,959
Issuances 796 6,945  
Interest accrual 3,295 13,710  
Derecognition (lapses and benefit payments) (9,493) (38,980)  
Ending balance at original discount rate 312,130 317,634  
Effect of changes in discount rate assumptions (18,187) (14,434)  
Ending balance, liability for future policy benefits $ 293,943 $ 303,200