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INVESTMENT IN RELATED PARTY INVESTMENT FUND - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]
Income (loss) from investment in Solasglas	$ (18,276)	$ 4,330	$ 13,921	$ 22,578
Solasglas Investments, LP (SILP) | GLRE Limited Partners
Schedule of Equity Method Investments [Line Items]
Equity method investments, fair value	$ 461,300		$ 461,300		$ 387,100
Equity method investment, ownership interest (as a percent)	79.70%		79.70%		77.90%
SILP General Partner
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest (as a percent)	20.30%		20.30%		22.10%

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