TENANT ORIGINATION AND ABSORPTION COSTS, ABOVE-MARKET LEASE ASSETS AND BELOW-MARKET LEASE LIABILITIES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Tenant Origination and Absorption Costs, Above-Market Lease Assets and Below-Market Lease Liabilities [Abstract]
Tenant Origination And Absorption Costs, Cost	$ 11,228		$ 11,228		$ 13,822
Tenant Origination and Absorption Costs, Accumulated Amortization	(5,567)		(5,567)		(6,818)
Tenant Origination and Absorption Costs, Net Amount	5,661		5,661		7,004
Tenant Origination and Absorption Costs, Amortization	(518)	$ (660)	(1,089)	$ (1,350)
Above-Market Lease Assets, Cost	213		213		213
Above-Market Lease Assets, Accumulated Amortization	(108)		(108)		(93)
Above-Market Lease Assets, Net Amount	105		105		120
Above-Market Lease Assets, Amortization	(8)	(8)	(15)	(15)
Below-Market Lease Liabilities, Cost	(5,393)		(5,393)		(6,213)
Below-Market Lease Liabilities, Accumulated Amortization	3,415		3,415		3,680
Below-Market Lease Liabilities, Net Amount	(1,978)		(1,978)		$ (2,533)
Below-Market Lease Liabilities, Amortization	$ 270	$ 323	$ 555	$ 673