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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Statement of Financial Position [Abstract] |  |
Fixed maturity securities, available-for-sale, amortized cost | $ 16,716,601 |
Equity securities, cost | 3,939,643 | $ 3,887,820
Senior long-term debt and other debt, fair value | $ 3,894,000 | $ 3,791,000

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