REAL ESTATE PROPERTIES - Ground Leases (Details)		12 Months Ended
		Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Ground Lease [Line Items]
Right-of-Use Assets - Ground Leases (operating)	[1]	$ 22,635,000	$ 11,073,000
Total ground lease expenditures for continuing and discontinued operations		$ 1,354,000	$ 1,051,000	$ 966,000
DFW Global Logistics Centre
Ground Lease [Line Items]
Borrowing rate used in present value calculation		5.00%
Ground leases [Member]
Ground Lease [Line Items]
Leases terms minimum		40 years
Leases terms maximum		50 years
Lease Expiration Date		August 2031
Ground lease expiration date, furthest date		October 2058
Renewal period option minimum		15 years
Renewal period option maximum		35 years
Payment increase interval minimum		3 years
Payment increase interval maximum		10 years
Weighted Average term for ground leases		38 years
Operating Leases, Future Minimum Payments Due, Next Twelve Months		$ 1,605,000
Operating Leases, Future Minimum Payments, Due in Two Years		1,610,000
Operating Leases, Future Minimum Payments, Due in Three Years		1,663,000
Operating Leases, Future Minimum Payments, Due in Four Years		1,697,000
Operating Leases, Future Minimum Payments, Due in Five Years		1,734,000
Operating leases, future minimum payments due, Thereafter		60,476,000
Operating leases, future minimum payments due, Total		68,785,000
Imputed interest	[2]	(45,887,000)
Operating Leases, Future Minimum Payments Due		$ 22,898,000
FLORIDA
Ground Lease [Line Items]
Properties subject to ground leases		2
TEXAS
Ground Lease [Line Items]
Properties subject to ground leases		4
ARIZONA
Ground Lease [Line Items]
Properties subject to ground leases		1
Accounting Standards Update 2016-02 [Member] | DFW Global Logistics Centre
Ground Lease [Line Items]
Right-of-Use Assets - Ground Leases (operating)		$ 12,708,000

[1] See Ground Leases discussion below for information regarding the Company’s right of use assets for ground leases.

[2] As the Company’s leases do not provide an implicit rate, in order to calculate the present value of the remaining ground lease payments, the Company used its incremental borrowing rate, adjusted for a number of factors, including the long-term nature of the ground leases, the Company’s estimated borrowing costs, and the estimated fair value of the underlying land, to determine the imputed interest for its ground leases. For the ground lease obtained during August 2021, the Company used its incremental borrowing rate, adjusted for the factors discussed above, which was determined to be 5.0%.