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Investments - Schedule of Realized and Unrealized Gains (Losses) on Investments and Net Investment Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Net realized and unrealized gains (losses) on investments: |  |  |  |
Net realized gains (losses) on investments | $ 93,711 | $ 42,403 | $ 382,646 | $ 32,363
Change in net unrealized gains (losses) on investments | (45,483) | 4,940 | 72,205 | 69,518
Net realized and unrealized gains (losses) on investments | 48,228 | 47,343 | 454,851 | 101,881
Net investment income (loss): |  |  |  |
Interest and other | 29,875 | 19,292 | 81,182 | 54,265
Management fees | (12,207) | (10,958) | (36,640) | (35,806)
Other expenses | (338) | (265) | (875) | (740)
Net investment income (loss) | 17,330 | 8,069 | 43,667 | 17,719
Total net realized and unrealized gains (losses) on investments and net investment income (loss) | 65,558 | 55,412 | 498,518 | 119,600
Total fixed maturities |  |  |  |
Net investment income (loss): |  |  |  |
Interest and other | 22,067 | 12,208 | 58,025 | 31,178
Short-term investments |  |  |  |
Net investment income (loss): |  |  |  |
Interest and other | 10 | 38 | 50 | 287
TS Hamilton Fund |  |  |  |
Net realized and unrealized gains (losses) on investments: |  |  |  |
Net realized gains (losses) on investments | 90,942 | 50,091 | 384,228 | 42,948
Change in net unrealized gains (losses) on investments | (110,386) | 17,758 | 21,901 | 79,318
Net investment income (loss): |  |  |  |
Interest and other | 3,108 | 3,121 | 9,040 | 13,033
Cash and cash equivalents |  |  |  |
Net investment income (loss): |  |  |  |
Interest and other | 4,384 | 4,029 | 12,594 | 8,752
Other |  |  |  |
Net investment income (loss): |  |  |  |
Interest and other | 306 | (104) | 1,473 | 1,015
Fixed maturities and short-term investments |  |  |  |
Net realized and unrealized gains (losses) on investments: |  |  |  |
Net realized gains (losses) on investments | 2,769 | (7,688) | (1,866) | (10,796)
Change in net unrealized gains (losses) on investments | 64,903 | (12,818) | 50,304 | (9,800)
Other |  |  |  |
Net realized and unrealized gains (losses) on investments: |  |  |  |
Net realized gains (losses) on investments | $ 0 | $ 0 | $ 284 | $ 211

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