INVESTMENT IN UNCONSOLIDATED JOINT VENTURES - Battery Point Series A-3 Preferred Units (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 20, 2019	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jul. 01, 2020	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities				$ 69,686		$ 78,276
Series A-3 Preferred Units | Battery Point Holdings
Schedule of Equity Method Investments [Line Items]
Obligation to use percent of net proceeds for future equity capital raising	20.00%
Point Trust LLC
Schedule of Equity Method Investments [Line Items]
Investment acquired (in shares)	210,000
Investment acquired (in dollars per shares)	$ 25
Number of shares purchased (in shares)						430,000
Stock repurchased during period						$ 10,800
Point Trust LLC | Series B Preferred Units
Schedule of Equity Method Investments [Line Items]
Redemptions of common stock (in shares)	13,000
Redemptions of common stock (in dollars per shares)	$ 1,000
Aggregate principal balance	$ 13,000
Investments								$ 4,500
Point Trust LLC | Series A-3 Preferred Units
Schedule of Equity Method Investments [Line Items]
Principal paydown	7,700
Investments	$ 5,300
Dividends, annual rate	7.50%
Number of shares purchased (in shares)			430,000
Stock repurchased during period			$ 10,800
Shares eliminated in consolidation due to acquisition							640,000
Distributions				900	$ 200
Point Trust LLC | Series A-3 Preferred Units | Not Redeemed by February 28, 2020
Schedule of Equity Method Investments [Line Items]
Dividends, annual rate	10.00%
Point Trust LLC | Series A-3 Preferred Units | Not Redeemed by February 28, 2021
Schedule of Equity Method Investments [Line Items]
Dividends, annual rate	11.00%
Battery Point Series A-3 Preferred Units
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities				$ 0		$ 13,991
Battery Point Series A-3 Preferred Units | Series A-3 Preferred Units
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities		$ 14,000
Gains on investment prior to acquisition		$ 2,000