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Investments in Fixed Maturity Securities (Amortized cost and fair value of fixed maturity securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]            
Amortized Cost, Due in one year or less $ 1,943,246          
Amortized Cost, Due after one year through five years 9,983,542          
Amortized Cost, Due after five years through ten years 4,262,692          
Amortized Cost, Due after ten years 2,945,631          
Amortized Cost, Mortgaged-backed securities 2,776,272          
Total investments in fixed maturity securities, Amortized Value 21,911,383          
Fair Value, Due in one year or less 1,884,790          
Fair Value, Due after one year through five years 9,601,275          
Fair Value, Due after five years through ten years 4,152,066          
Fair Value, Due after ten years 2,850,702          
Fair Value, Mortgage-backed securities 2,595,669          
Total investments in fixed maturity securities, Fair Value 21,084,502   $ 20,181,547      
Cumulative effect adjustment resulting from changes in accounting principles $ 34 $ 38 $ 43 $ 53 $ 107 $ 114