v3.26.1
Investments (Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturity Securities By Contractual Maturity Date) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, amortized cost $ 2,172,638  
Due after one year through five years, amortized cost 6,579,483  
Due after five years through ten years, amortized cost 5,237,767  
Due after ten years, amortized cost 1,184,360  
Amortized cost, sub-total 15,174,248  
Total fixed maturity securities, amortized cost 18,207,316  
Due in one year or less, estimated fair value 2,171,438  
Due after one year through five years, estimated fair value 6,530,862  
Due after five years through ten years, estimated fair value 5,169,709  
Due after ten years, estimated fair value 1,090,953  
Estimated fair value, sub-total 14,962,962  
Total fixed maturity securities, estimated fair value 17,943,781 $ 17,797,986
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 3,033,068  
Fixed maturity securities, estimated fair value $ 2,980,819