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Investments - Net Investment Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Investment income (loss) from portfolios |  |  |  |
Total investment income | $ 17,893 | $ 14,872 | $ 50,628 | $ 30,653
Less: investment expenses | 571 | 230 | 1,393 | 293
Net investment income | 17,322 | 14,642 | 49,235 | 30,360
Available-for-sale securities |  |  |  |
Investment income (loss) from portfolios |  |  |  |
Available-for-sale, equity securities, cash equivalents, and other | 12,891 | 11,037 | 36,611 | 31,404
Equity securities |  |  |  |
Investment income (loss) from portfolios |  |  |  |
Available-for-sale, equity securities, cash equivalents, and other | 1,119 | 1,161 | 3,536 | 3,260
Limited partnerships |  |  |  |
Investment income (loss) from portfolios |  |  |  |
Limited partnerships | (127) | (13) | 134 | (10,725)
Cash equivalents and other |  |  |  |
Investment income (loss) from portfolios |  |  |  |
Available-for-sale, equity securities, cash equivalents, and other | $ 4,010 | $ 2,687 | $ 10,347 | $ 6,714

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