Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Name:	us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

INVESTMENT IN RELATED PARTY INVESTMENT FUND - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Aug. 01, 2024	Jul. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Share of Solasglas' net income (loss) (see Note 3)			$ 19,844	$ (1,853)	$ 42,422	$ 27,791
Solasglas Investments, LP (SILP)
Schedule of Equity Method Investments [Line Items]
Investment cap percentage	70.00%	60.00%
Solasglas Investments, LP (SILP) \| GLRE Limited Partners
Schedule of Equity Method Investments [Line Items]
Equity method investments, fair value			$ 397,900		$ 397,900		$ 258,900
Equity method investment, ownership interest (as a percent)			77.20%		77.20%		72.70%
SILP General Partner
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest (as a percent)			22.80%		22.80%		27.30%