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INVESTMENT IN RELATED PARTY INVESTMENT FUND - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]
Income from investment in Solasglas	$ 32,197	$ 18,248
Solasglas Investments, LP (SILP) | GLRE Limited Partners
Schedule of Equity Method Investments [Line Items]
Equity method investments, fair value	$ 435,300		$ 387,100
Equity method investment, ownership interest (as a percent)	77.80%		77.90%
SILP General Partner
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest (as a percent)	22.20%		22.10%

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