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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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