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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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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

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