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Investments (Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturities By Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, amortized cost $ 1,593,149  
Due after one year through five years, amortized cost 6,071,013  
Due after five years through ten years, amortized cost 4,647,538  
Due after ten years, amortized cost 1,252,061  
Amortized cost, sub-total 13,563,761  
Fixed maturities, amortized cost 16,457,723  
Due in one year or less, estimated fair value 1,571,022  
Due after one year through five years, estimated fair value 5,901,682  
Due after five years through ten years, estimated fair value 4,406,225  
Due after ten years, estimated fair value 1,098,767  
Estimated fair value, sub-total 12,977,696  
Available-for-sale fixed maturity investments, estimated fair value 15,745,539 $ 14,372,732
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 2,893,962  
Estimated fair value $ 2,767,843