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Investments (Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturity Securities By Contractual Maturity Date) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, amortized cost $ 1,792,801  
Due after one year through five years, amortized cost 6,637,351  
Due after five years through ten years, amortized cost 4,815,043  
Due after ten years, amortized cost 1,207,144  
Amortized cost, sub-total 14,452,339  
Total fixed maturity securities, amortized cost 17,386,303  
Due in one year or less, estimated fair value 1,791,213  
Due after one year through five years, estimated fair value 6,670,523  
Due after five years through ten years, estimated fair value 4,792,723  
Due after ten years, estimated fair value 1,114,200  
Estimated fair value, sub-total 14,368,659  
Total fixed maturity securities, estimated fair value 17,259,981 $ 15,745,539
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 2,933,964  
Fixed maturity securities, estimated fair value $ 2,891,322