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Deferred Policy Acquisition Costs and Deferred Sales Inducements (Schedule of Deferred Sales Inducements) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Movement in Deferred Sales Inducements [Roll Forward]      
Beginning balance, deferred sales inducement costs $ 2,367,224 $ 2,045,683 $ 2,045,683
Capitalizations 127,704 45,267 513,793
Amortization expense (54,214) (46,601) (192,252)
Ending balance, deferred sales inducement costs 2,440,714   2,367,224
Fixed Index Annuities      
Movement in Deferred Sales Inducements [Roll Forward]      
Beginning balance, deferred sales inducement costs 2,342,486 2,017,960 2,017,960
Capitalizations 127,687   513,726
Amortization expense (53,526)   (189,200)
Ending balance, deferred sales inducement costs 2,416,647   2,342,486
Fixed Rate Annuities      
Movement in Deferred Sales Inducements [Roll Forward]      
Beginning balance, deferred sales inducement costs 24,738 $ 27,723 27,723
Capitalizations 17   67
Amortization expense (688)   (3,052)
Ending balance, deferred sales inducement costs $ 24,067   $ 24,738