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Fair Value Measurements - Ltd Partnerships Gain (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment related gains (losses), net | $ 827 | $ (892) | $ 1,537 | $ (477)
Limited Partnership Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment related gains (losses), net | $ 500 | $ (100) | $ 1,800 | $ 200

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