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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Statement of Financial Position [Abstract] |  |
Fixed maturity securities, available-for-sale (amortized cost of $14,932,286 in 2023 and $12,805,887 in 2022) | $ 14,932,286 | $ 12,805,887
Equity securities (cost of $3,497,071 in 2023 and $3,100,040 in 2022) | 3,497,071 | 3,100,040
Senior long-term debt and other debt (estimated fair value of $3,353,000 in 2023 and $3,541,000 in 2022) | $ 3,353,000 | $ 3,541,000

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