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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
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, amortized cost $ 1,108,711  
Due after one year through five years, amortized cost 5,268,266  
Due after five years through ten years, amortized cost 4,482,619  
Due after ten years, amortized cost 1,503,598  
Amortized cost, sub-total 12,363,194  
Total fixed maturities, amortized cost 15,227,752 $ 14,932,286
Due in one year or less, estimated fair value 1,091,274  
Due after one year through five years, estimated fair value 5,082,020  
Due after five years through ten years, estimated fair value 4,278,074  
Due after ten years, estimated fair value 1,358,168  
Estimated fair value, sub-total 11,809,536  
Total fixed maturities, estimated fair value 14,519,370 14,372,732
Commercial mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, amortized cost 2,400,848  
Total fixed maturities, amortized cost 2,400,848 2,371,406
Fixed maturities, estimated fair value 2,268,156  
Total fixed maturities, estimated fair value 2,268,156 2,243,658
Residential mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, amortized cost 463,710  
Total fixed maturities, amortized cost 463,710 491,949
Fixed maturities, estimated fair value 441,678  
Total fixed maturities, estimated fair value $ 441,678 $ 470,422