INVESTMENT IN EQUITY SECURITIES (Details) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 17, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2016	Dec. 31, 2019
Marketable Securities [Line Items]
Investment in equity securities		$ 30,047,000		$ 30,047,000			$ 42,618,000
Unrealized gain (loss) from change in fair value		$ (11,224,000)	$ 11,787,000	(12,571,000)	$ 14,025,000
Number of investment shares disposed (in shares)		0	600,000		600,000
Proceeds from investment shares sold		$ 0	$ 6,500,000	$ 0	$ 6,500,000
RESI
Marketable Securities [Line Items]
Number of investment shares acquired (in shares)						4,100,000
Number of securities outstanding (in shares)		3,500,000		3,500,000			3,500,000
Investment in equity securities		$ 30,000,000.0		$ 30,000,000.0			$ 42,600,000
Unrealized gain (loss) from change in fair value				(12,600,000)	14,000,000.0
Realized gain (loss) from change in fair value			1,200,000		1,500,000
Investment income, dividend		$ 0	$ 500,000	$ 500,000	$ 1,200,000
Price of shares in merger agreement (in dollars per share)	$ 12.50