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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Fixed maturities, available-for-sale, amortized cost $ 15,227,752 $ 14,932,286
Equity securities, cost 3,573,927 3,497,071
Senior long-term debt and other debt, fair value $ 3,386,000 $ 3,353,000