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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Expenses |  |  |  |
Interest | $ (1,430) | $ (2,018) | $ (4,038) | $ (4,827)
Total expenses | (149,950) | (152,048) | (491,774) | (482,273)
Net investment income (loss) | (2,950) | 10,454 | 15,807 | 34,580
Realized and change in unrealized gains (losses) |  |  |  |
Net gain (loss) on investment transactions | (11,877) | 0 | (11,731) | (324)
Net increase in Partners' capital | (4,405) | 35,237 | 25,551 | 70,234
Income (loss) from investment in related party investment fund (Note 3) | (14,404) | 19,844 | (483) | 42,422
Management fees | 1,695 | 1,613 | 5,181 | 4,344
Performance allocation | (1,519) | 2,205 | 28 | 4,714
Total | 176 | 3,818 | 5,209 | 9,058
Solasglas Investments, LP (SILP) |  |  |  |
Realized and change in unrealized gains (losses) |  |  |  |
Income (loss) from investment in related party investment fund (Note 3) | (14,404) | 19,844 | (483) | 42,422
Solasglas Investments, LP (SILP) |  |  |  |
Investment income |  |  |  |
Dividend income (net of withholding taxes) | 1,030 | 752 | 5,207 | 2,524
Interest income | 5,060 | 3,540 | 13,509 | 10,040
Total Investment income | 6,090 | 4,292 | 18,716 | 12,564
Expenses |  |  |  |
Management fee | (1,695) | (1,613) | (5,181) | (4,344)
Interest | (4,924) | (817) | (10,395) | (2,887)
Dividends | (884) | (782) | (2,561) | (2,217)
Research and operating | (335) | (262) | (1,306) | (921)
Total expenses | (7,838) | (3,474) | (19,443) | (10,369)
Net investment income (loss) | (1,748) | 818 | (727) | 2,195
Realized and change in unrealized gains (losses) |  |  |  |
Net realized gain (loss) | (57,283) | 23,647 | (1,594) | 86,677
Net change in unrealized appreciation (depreciation) | 39,484 | 4,801 | 4,246 | (24,582)
Net gain (loss) on investment transactions | (17,799) | 28,448 | 2,652 | 62,095
Net increase in Partners' capital | $ (19,547) | $ 29,265 | $ 1,925 | $ 64,289

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