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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Statement of Financial Position [Abstract] |  |
Fixed maturity securities, available-for-sale (amortized cost of $16,457,723 in 2024 and $14,932,286 in 2023) | $ 16,457,723 |
Equity securities (cost of $3,887,820 in 2024 and $3,497,071 in 2023) | 3,887,820 | $ 3,497,071
Senior long-term debt and other debt (estimated fair value of $3,791,000 in 2024 and $3,353,000 in 2023) | $ 3,791,000 | $ 3,353,000

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