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Fair Value Measurements - Ltd Partnerships Gain (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment related gains (losses), net | $ (2,894) | $ 963
Limited Partnership Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment related gains (losses), net | $ (1,500) | $ 1,300

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