INVESTMENT IN RELATED PARTY INVESTMENT FUND Summarized Statements of Assets, Liabilities and Net Assets of SILP (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Liabilities
GLRE Limited Partners’ share of Net Assets	$ 177,658	$ 240,056
Solasglas Investment LP (SILP) | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Assets
Investments, at fair value	150,204	162,928
Derivative contracts, at fair value	2,909	6,324
Due from brokers	88,268	68,060
Cash and cash equivalents	54,719	111,046
Interest and dividends receivable	27	47
Total assets	296,127	348,405
Liabilities
Investments sold short, at fair value	(59,791)	(47,834)
Derivative contracts, at fair value	(10,814)	(2,054)
Due to brokers	(745)	(1,180)
Interest and dividends payable	(197)	(828)
Other liabilities	(89)	(101)
Total liabilities	(71,636)	(51,997)
Net Assets	224,491	296,408
GLRE Limited Partners’ share of Net Assets	$ 177,658	$ 240,056