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Life and Annuity Benefits (Liability for Future Policy Benefit, Activity) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Liability for Future Policy Benefits Activity [Abstract]        
Liability for future policyholder benefits, beginning of year $ 554,366 $ 821,632    
Liability for future policyholder benefits at original discount rate, beginning of year 667,761 745,313    
Effect of changes in cash flow assumptions     $ 0 $ 0
Effect of actual variances from expected experience     (5,890) $ (3,859)
Adjusted liability for future policyholder benefits, beginning of year 661,871 741,454    
Interest accretion 11,251 11,909    
Benefit payments (39,819) (40,643)    
Effect of foreign currency changes (356) (77,166)    
Liability for future policy holder benefits t original discount rate, end of period 632,947 635,554    
Cumulative effect of changes in discount rate assumptions (124,511) (112,459)    
Liability for future policyholder benefits, beginning of year, ending of period [1] 508,436 $ 523,095    
Undiscounted liability for future policyholder benefits $ 813,600   $ 822,300  
[1] The undiscounted liability for future policyholder benefits was $813.6 million and $822.3 million as of September 30, 2023 and 2022, respectively.