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INVESTMENT IN RELATED PARTY INVESTMENT FUND - Schedule of Summarized Statements of Assets, Liabilities and Net Assets of SILP (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Expenses    
Interest $ (1,464) $ (1,249)
Total expenses (182,393) (163,775)
Net investment income 8,287 13,178
Realized and change in unrealized gains (losses)    
Net gain on investment transactions 111 (413)
Net increase (decrease) in Partners' capital 29,627 27,019
Income from investment in related party investment fund (net of related party expenses - Note 3) 32,197 18,248
Management fees 1,730 1,323
Performance allocation 3,578 2,028
Total 5,308 3,351
Solasglas Investments, LP (SILP)    
Realized and change in unrealized gains (losses)    
Income from investment in related party investment fund (net of related party expenses - Note 3) 32,197 18,248
Solasglas Investments, LP (SILP)    
Investment income    
Dividend income (net of withholding taxes) 1,490 831
Interest income 3,627 4,352
Total Investment income 5,117 5,183
Expenses    
Management fee (1,730) (1,323)
Interest (1,701) (1,334)
Dividends (761) (704)
Research and operating (485) (324)
Total expenses (4,677) (3,685)
Net investment income 440 1,498
Realized and change in unrealized gains (losses)    
Net realized gain (loss) 19,105 42,945
Net change in unrealized appreciation (depreciation) 27,018 (16,245)
Net gain on investment transactions 46,123 26,700
Net increase (decrease) in Partners' capital $ 46,563 $ 28,198