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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Fixed maturities, available-for-sale, amortized cost $ 14,067,742 $ 12,805,887
Equity securities, cost 3,401,511 3,100,040
Senior long-term debt and other debt, fair value $ 3,060,000 $ 3,541,000