v3.26.1
Investments (Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturity Securities By Contractual Maturity Date) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, amortized cost $ 2,231,948  
Due after one year through five years, amortized cost 6,442,642  
Due after five years through ten years, amortized cost 5,151,631  
Due after ten years, amortized cost 1,176,477  
Amortized cost, sub-total 15,002,698  
Total fixed maturity securities, amortized cost 18,044,608  
Due in one year or less, estimated fair value 2,232,541  
Due after one year through five years, estimated fair value 6,357,047  
Due after five years through ten years, estimated fair value 5,063,447  
Due after ten years, estimated fair value 1,082,838  
Estimated fair value, sub-total 14,735,873  
Total fixed maturity securities, estimated fair value 17,708,607 $ 17,797,986
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 3,041,910  
Fixed maturity securities, estimated fair value $ 2,972,734