REAL ESTATE AND RELATED LEASE INTANGIBLES, NET - Schedule of Real Estate Properties Acquired (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	May 31, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 16, 2019	Feb. 28, 2019	Feb. 27, 2019
Business Acquisition [Line Items]
Purchase Price			$ 104,591	$ 122,707
Real estate acquired through foreclosure			84,150
Lease Real Estate
Business Acquisition [Line Items]
Purchase Price			$ 20,441	$ 13,154
Ownership Interest			100.00%	100.00%
Omaha, NE | Diversified
Business Acquisition [Line Items]
Real estate acquired through foreclosure						$ 18,200	$ 18,200
Ownership Interest			100.00%
San Diego, CA | Diversified
Business Acquisition [Line Items]
Real estate acquired through foreclosure			$ 42,250		$ 42,300
Ownership Interest			100.00%
Fort Worth and Arlington, TX | Diversified
Business Acquisition [Line Items]
Real estate acquired through foreclosure			$ 23,700
Ownership Interest			100.00%
Lithia Springs, GA | Diversified
Business Acquisition [Line Items]
Purchase Price		$ 24,466
Ownership Interest				70.60%
Lithia Springs, GA | Diversified | Corporate Joint Venture
Business Acquisition [Line Items]
Purchase Price		$ 2,900
Isla Vista, CA | Diversified
Business Acquisition [Line Items]
Purchase Price	$ 85,087
Ownership Interest				75.00%
Isla Vista, CA | Diversified | Corporate Joint Venture
Business Acquisition [Line Items]
Purchase Price	$ 4,600