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Investments in Fixed Maturity Securities (Amortized cost and fair value of fixed maturity securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]            
Amortized Cost, Due in one year or less $ 1,728,802          
Amortized Cost, Due after one year through five years 9,001,644          
Amortized Cost, Due after five years through ten years 4,046,210          
Amortized Cost, Due after ten years 5,144,357          
Amortized Cost, Mortgaged-backed securities 4,448,676          
Total investments in fixed maturity securities, Amortized Value 24,369,689          
Fair Value, Due in one year or less 1,720,156          
Fair Value, Due after one year through five years 8,861,485          
Fair Value, Due after five years through ten years 4,065,444          
Fair Value, Due after ten years 5,117,452          
Fair Value, Mortgage-backed securities 4,329,733          
Total investments in fixed maturity securities, Fair Value 24,094,270   $ 22,399,426      
Cumulative effect adjustment resulting from changes in accounting principles $ 14 $ 20 $ 25 $ 34 $ 38 $ 43