v3.25.1
Investments (Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturity Securities By Contractual Maturity Date) (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, amortized cost $ 1,584,937  
Due after one year through five years, amortized cost 6,422,711  
Due after five years through ten years, amortized cost 4,657,827  
Due after ten years, amortized cost 1,169,525  
Amortized cost, sub-total 13,835,000  
Total fixed maturity securities, amortized cost 16,716,601  
Due in one year or less, estimated fair value 1,568,859  
Due after one year through five years, estimated fair value 6,349,767  
Due after five years through ten years, estimated fair value 4,511,211  
Due after ten years, estimated fair value 1,046,966  
Estimated fair value, sub-total 13,476,803  
Total fixed maturity securities, estimated fair value 16,277,629 $ 15,745,539
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 2,881,601  
Fixed maturity securities, estimated fair value $ 2,800,826