INVESTMENT IN RELATED PARTY INVESTMENT FUND Summarized Statements of Assets, Liabilities and Net Assets of SILP (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Liabilities
GLRE Limited Partners’ share of Net Assets	$ 184,956	$ 240,056
Solasglas Investment LP (SILP) | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Assets
Investments, at fair value	220,116	162,928
Derivative contracts, at fair value	3,097	6,324
Due from brokers	130,220	68,060
Cash and cash equivalents	2,202	111,046
Interest and dividends receivable	281	47
Total assets	355,916	348,405
Liabilities
Investments sold short, at fair value	(116,336)	(47,834)
Derivative contracts, at fair value	(10,962)	(2,054)
Due to brokers	0	(1,180)
Interest and dividends payable	(32)	(828)
Other liabilities	(233)	(101)
Total liabilities	(127,563)	(51,997)
Net Assets	228,353	296,408
GLRE Limited Partners’ share of Net Assets	$ 184,956	$ 240,056