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Fair Value Measurements - Ltd Partnerships Gain (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment related gains (losses), net | $ 2,408 | $ (253) | $ (486) | $ 710
Limited Partnership Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment related gains (losses), net | $ 2,900 | $ 4 | $ 1,400 | $ 1,300

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