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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