REAL ESTATE AND RELATED LEASE INTANGIBLES, NET - Schedule of Real Estate Properties Acquired (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020	Feb. 28, 2019
Business Acquisition [Line Items]
Purchase Price	$ 36,750	$ 104,591
Real estate acquired through foreclosure	29,310	84,150
Lease Real Estate
Business Acquisition [Line Items]
Purchase Price	$ 7,440	$ 20,441
Ownership Interest	100.00%	100.00%
Los Angeles, California | Diversified
Business Acquisition [Line Items]
Real estate acquired through foreclosure	$ 21,535
Ownership Interest	100.00%
Winston Salem, North Carolina | Diversified
Business Acquisition [Line Items]
Real estate acquired through foreclosure	$ 3,900		$ 3,900
Ownership Interest	100.00%
South Bend, IN | Diversified
Business Acquisition [Line Items]
Real estate acquired through foreclosure	$ 3,875
Ownership Interest	100.00%
Omaha, NE | Diversified
Business Acquisition [Line Items]
Real estate acquired through foreclosure				$ 18,200
Ownership Interest		100.00%
San Diego, California | Diversified
Business Acquisition [Line Items]
Real estate acquired through foreclosure		$ 42,250
Ownership Interest		100.00%
Fort Worth And Arlington, Texas | Diversified
Business Acquisition [Line Items]
Real estate acquired through foreclosure		$ 23,700
Ownership Interest		100.00%