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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, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, amortized cost $ 1,245,195  
Due after one year through five years, amortized cost 4,731,573  
Due after five years through ten years, amortized cost 3,655,839  
Due after ten years, amortized cost 1,624,556  
Amortized cost, sub-total 11,257,163  
Total fixed maturities, amortized cost 14,067,742 $ 12,805,887
Due in one year or less, estimated fair value 1,221,058  
Due after one year through five years, estimated fair value 4,490,492  
Due after five years through ten years, estimated fair value 3,269,429  
Due after ten years, estimated fair value 1,400,889  
Estimated fair value, sub-total 10,381,868  
Total fixed maturities, estimated fair value 12,951,279 11,856,835
Commercial mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, amortized cost 2,297,828  
Total fixed maturities, amortized cost 2,297,828 2,109,721
Fixed maturities, estimated fair value 2,089,373  
Total fixed maturities, estimated fair value 2,089,373 1,940,448
Residential mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, amortized cost 511,525  
Total fixed maturities, amortized cost 511,525 553,591
Fixed maturities, estimated fair value 478,840  
Total fixed maturities, estimated fair value 478,840 526,793
Asset-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, amortized cost 1,226  
Total fixed maturities, amortized cost 1,226 1,693
Fixed maturities, estimated fair value 1,198  
Total fixed maturities, estimated fair value $ 1,198 $ 1,640