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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
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, amortized cost $ 1,193,540  
Due after one year through five years, amortized cost 4,544,954  
Due after five years through ten years, amortized cost 3,382,145  
Due after ten years, amortized cost 1,771,463  
Amortized cost, sub-total 10,892,102  
Total fixed maturities, amortized cost 13,653,557 $ 12,805,887
Due in one year or less, estimated fair value 1,170,094  
Due after one year through five years, estimated fair value 4,325,414  
Due after five years through ten years, estimated fair value 3,077,695  
Due after ten years, estimated fair value 1,617,807  
Estimated fair value, sub-total 10,191,010  
Total fixed maturities, estimated fair value 12,745,692 11,856,835
Commercial mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, amortized cost 2,251,522  
Total fixed maturities, amortized cost 2,251,522 2,109,721
Fixed maturities, estimated fair value 2,073,556  
Total fixed maturities, estimated fair value 2,073,556 1,940,448
Residential mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, amortized cost 508,692  
Total fixed maturities, amortized cost 508,692 553,591
Fixed maturities, estimated fair value 479,922  
Total fixed maturities, estimated fair value 479,922 526,793
Asset-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, amortized cost 1,241  
Total fixed maturities, amortized cost 1,241 1,693
Fixed maturities, estimated fair value 1,204  
Total fixed maturities, estimated fair value $ 1,204 $ 1,640