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Investments - Schedule of Net Investment Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Investment Income, Net [Abstract] |  |  |  |
Investment income | $ 27,127 | $ 22,772 | $ 76,425 | $ 63,423
Investment expenses | (354) | (298) | (1,017) | (825)
Net investment income | 26,773 | 22,474 | 75,408 | 62,598
Cash and Cash Equivalents |  |  |  |
Investment Income, Net [Abstract] |  |  |  |
Investment income | $ 900 | $ 1,300 | $ 2,900 | $ 4,200

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