v3.26.3
Investments (Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturity Securities By Contractual Maturity Date) (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, amortized cost $ 2,084,296  
Due after one year through five years, amortized cost 6,576,638  
Due after five years through ten years, amortized cost 5,156,621  
Due after ten years, amortized cost 1,204,831  
Amortized cost, sub-total 15,022,386  
Total fixed maturity securities, amortized cost 18,182,889  
Due in one year or less, estimated fair value 2,083,791  
Due after one year through five years, estimated fair value 6,341,782  
Due after five years through ten years, estimated fair value 4,836,669  
Due after ten years, estimated fair value 1,039,809  
Estimated fair value, sub-total 14,302,051  
Total fixed maturity securities, estimated fair value 17,295,062 $ 17,797,986
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 3,160,503  
Fixed maturity securities, estimated fair value $ 2,993,011