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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Fixed maturity securities, available-for-sale, amortized cost	$ 17,386,303
Equity securities, cost	4,024,656	$ 3,887,820
Senior long-term debt and other debt, fair value	$ 3,872,000	$ 3,791,000

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