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Investments in Fixed Maturity Securities (Amortized cost and fair value of fixed maturity securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]            
Amortized Cost, Due in one year or less $ 1,725,973          
Amortized Cost, Due after one year through five years 8,643,436          
Amortized Cost, Due after five years through ten years 3,941,977          
Amortized Cost, Due after ten years 5,771,357          
Amortized Cost, Mortgaged-backed securities 5,053,558          
Total investments in fixed maturity securities, Amortized Value 25,136,301          
Fair Value, Due in one year or less 1,709,614          
Fair Value, Due after one year through five years 8,513,861          
Fair Value, Due after five years through ten years 3,971,308          
Fair Value, Due after ten years 5,782,835          
Fair Value, Mortgage-backed securities 4,971,476          
Total investments in fixed maturity securities, Fair Value 24,949,094   $ 22,399,426      
Cumulative effect adjustment resulting from changes in accounting principles $ 11 $ 14 $ 25 $ 30 $ 34 $ 43