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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, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, amortized cost $ 1,192,021  
Due after one year through five years, amortized cost 5,033,324  
Due after five years through ten years, amortized cost 4,320,467  
Due after ten years, amortized cost 1,523,119  
Amortized cost, sub-total 12,068,931  
Fixed maturities, amortized cost 14,932,286 $ 12,805,887
Due in one year or less, estimated fair value 1,179,344  
Due after one year through five years, estimated fair value 4,917,770  
Due after five years through ten years, estimated fair value 4,159,846  
Due after ten years, estimated fair value 1,401,692  
Estimated fair value, sub-total 11,658,652  
Available-for-sale fixed maturity investments, estimated fair value 14,372,732 11,856,835
Commercial mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 2,371,406  
Fixed maturities, amortized cost 2,371,406 2,109,721
Estimated fair value 2,243,658  
Available-for-sale fixed maturity investments, estimated fair value 2,243,658 1,940,448
Residential mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 491,949  
Fixed maturities, amortized cost 491,949 553,591
Estimated fair value 470,422  
Available-for-sale fixed maturity investments, estimated fair value $ 470,422 $ 526,793