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INVESTMENT IN RELATED PARTY INVESTMENT FUND - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income (loss) from investment in Solasglas | $ (14,404) | $ 19,844 | $ (483) | $ 42,422 |
Solasglas Investments, LP (SILP) | GLRE Limited Partners |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments, fair value | $ 456,900 |  | $ 456,900 |  | $ 387,100
Equity method investment, ownership interest (as a percent) | 81.60% |  | 81.60% |  | 77.90%
SILP General Partner |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership interest (as a percent) | 18.40% |  | 18.40% |  | 22.10%

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