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Investments - Realized and Unrealized Gains (Losses) on Investments and Net Investment Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Net realized and unrealized gains (losses) on investments: |  |  |  |
Net realized gains (losses) on investments | $ 42,403 | $ 115,129 | $ 32,363 | $ 267,140
Change in net unrealized gains (losses) on investments | 4,940 | (182,509) | 69,518 | (120,500)
Net realized and unrealized gains (losses) on investments | 47,343 | (67,380) | 101,881 | 146,640
Net investment income (loss): |  |  |  |
Interest and other | 19,292 | 9,422 | 54,265 | 19,149
Management fees | (10,958) | (14,420) | (35,806) | (40,601)
Other expenses | (265) | (257) | (740) | (733)
Net investment income (loss) | 8,069 | (5,255) | 17,719 | (22,185)
Total realized and unrealized gains (losses) on investments and net investment income (loss) | 55,412 | (72,635) | 119,600 | 124,455
Total fixed maturities |  |  |  |
Net investment income (loss): |  |  |  |
Interest and other | 12,208 | 5,880 | 31,178 | 14,343
Short-term investments |  |  |  |
Net investment income (loss): |  |  |  |
Interest and other | 38 | 334 | 287 | 737
TS Hamilton Fund |  |  |  |
Net realized and unrealized gains (losses) on investments: |  |  |  |
Net realized gains (losses) on investments | 50,091 | 118,442 | 42,948 | 279,977
Change in net unrealized gains (losses) on investments | 17,758 | (143,953) | 79,318 | (18,740)
Net investment income (loss): |  |  |  |
Interest and other | 3,121 | 3,095 | 13,033 | 4,603
Cash and cash equivalents |  |  |  |
Net investment income (loss): |  |  |  |
Interest and other | 4,029 | 544 | 8,752 | 696
Other |  |  |  |
Net investment income (loss): |  |  |  |
Interest and other | (104) | (431) | 1,015 | (1,230)
Fixed maturities and short-term investments |  |  |  |
Net realized and unrealized gains (losses) on investments: |  |  |  |
Net realized gains (losses) on investments | (7,688) | (3,313) | (10,796) | (13,684)
Change in net unrealized gains (losses) on investments | (12,818) | (38,556) | (9,800) | (101,760)
Other |  |  |  |
Net realized and unrealized gains (losses) on investments: |  |  |  |
Net realized gains (losses) on investments | $ 0 | $ 0 | $ 211 | $ 847

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