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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, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, amortized cost $ 1,076,011  
Due after one year through five years, amortized cost 5,685,191  
Due after five years through ten years, amortized cost 4,727,163  
Due after ten years, amortized cost 1,473,947  
Amortized cost, sub-total 12,962,312  
Total fixed maturities, amortized cost 15,721,795 $ 14,932,286
Due in one year or less, estimated fair value 1,062,673  
Due after one year through five years, estimated fair value 5,482,759  
Due after five years through ten years, estimated fair value 4,508,491  
Due after ten years, estimated fair value 1,311,513  
Estimated fair value, sub-total 12,365,436  
Total fixed maturities, estimated fair value 14,977,514 14,372,732
Commercial mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, amortized cost 2,325,529  
Total fixed maturities, amortized cost 2,325,529 2,371,406
Fixed maturities, estimated fair value 2,199,628  
Total fixed maturities, estimated fair value 2,199,628 2,243,658
Residential mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, amortized cost 433,954  
Total fixed maturities, amortized cost 433,954 491,949
Fixed maturities, estimated fair value 412,450  
Total fixed maturities, estimated fair value $ 412,450 $ 470,422