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Fair Value Measurements - Ltd Partnerships Gain (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment related gains (losses), net | $ (1,255) | $ 827 | $ (1,741) | $ 1,537
Limited Partnership Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment related gains (losses), net | $ (3,700) | $ 500 | $ (2,300) | $ 1,800

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