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Deferred Policy Acquisition Costs and Deferred Sales Inducements (Schedule of Deferred Policy Acquisition Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Beginning balance, deferred policy acquisition costs $ 3,070,280 $ 2,773,643 $ 2,773,643
Capitalizations 191,814   576,337
Amortization of deferred policy acquisition costs (77,337) (68,235) (279,700)
Ending balance, deferred policy acquisition costs 3,184,757   3,070,280
Fixed Index Annuities      
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Beginning balance, deferred policy acquisition costs 2,957,464 2,649,322 2,649,322
Capitalizations 159,143   557,749
Amortization of deferred policy acquisition costs (69,525)   (249,607)
Ending balance, deferred policy acquisition costs 3,047,082   2,957,464
Fixed Rate Annuities      
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Beginning balance, deferred policy acquisition costs 109,187 120,105 120,105
Capitalizations 32,655   18,536
Amortization of deferred policy acquisition costs (7,671)   (29,454)
Ending balance, deferred policy acquisition costs 134,171   109,187
Single Premium Immediate Annuities      
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Beginning balance, deferred policy acquisition costs 3,629 $ 4,216 4,216
Capitalizations 16   52
Amortization of deferred policy acquisition costs (141)   (639)
Ending balance, deferred policy acquisition costs $ 3,504   $ 3,629