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Life and Annuity Benefits (Liability for Future Policy Benefit, Activity) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Liability for Future Policy Benefits Activity [Abstract]        
Liability for future policyholder benefits, beginning of year $ 557,763 $ 554,366    
Liability for future policyholder benefits at original discount rate, beginning of year 642,877 667,761    
Effect of changes in cash flow assumptions     $ 0 $ 0
Effect of actual variances from expected experience     0 $ 0
Adjusted liability for future policyholder benefits, beginning of year 642,877 667,761    
Interest accretion 3,605 3,815    
Benefit payments (13,290) (13,283)    
Effect of foreign currency changes (11,706) 10,396    
Liability for future policy holder benefits t original discount rate, end of period 621,486 668,689    
Cumulative effect of changes in discount rate assumptions (93,237) (101,938)    
Liability for future policyholder benefits, beginning of year, ending of period [1] 528,249 $ 566,751    
Undiscounted liability for future policyholder benefits $ 796,800   $ 862,700  
[1] The undiscounted liability for future policyholder benefits was $796.8 million and $862.7 million as of March 31, 2024 and 2023, respectively.