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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Fixed maturity securities, available-for-sale, amortized cost $ 16,265,743 $ 14,932,286
Equity securities, cost 3,798,549 3,497,071
Senior long-term debt and other debt, fair value $ 4,028,000 $ 3,353,000