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REAL ESTATE INVESTMENTS AND MINIMUM FUTURE RENTALS - Acquisitions (Details) - USD ($) $ in Thousands		1 Months Ended					12 Months Ended
	May 25, 2017	Nov. 30, 2018	Sep. 30, 2018	Jul. 31, 2018	Aug. 31, 2017	Jul. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Real Estate Acquisitions
Contract Purchase Price							$ 79,503	$ 43,150
Third Party Real Estate Acquisition Costs, Capitalized							787	387
Campania International/U.S. Tape industrial facility, Pennsburg, Pennsylvania
Real Estate Acquisitions
Contract Purchase Price							12,675
Third Party Real Estate Acquisition Costs, Capitalized							226
New mortgage debt				$ 8,238
Plymouth Industries industrial facility, Plymouth, Minnesota
Real Estate Acquisitions
Contract Purchase Price							5,500
Third Party Real Estate Acquisition Costs, Capitalized							50
New mortgage debt			$ 3,325
Applied Control Industrial Facility, Eaglewood, Colorado
Real Estate Acquisitions
Contract Purchase Price							12,800
Third Party Real Estate Acquisition Costs, Capitalized							62
Xerimis industrial facility, Moorestown, New Jersey
Real Estate Acquisitions
Contract Purchase Price							7,350
Third Party Real Estate Acquisition Costs, Capitalized							147
New mortgage debt		$ 4,000
Multi-tenant industrial facility, Moorestown, New Jersey
Real Estate Acquisitions
Contract Purchase Price							13,498
Third Party Real Estate Acquisition Costs, Capitalized							110
Men's Warehouse industrial facility, Bakersfield, California
Real Estate Acquisitions
Contract Purchase Price							10,850
Third Party Real Estate Acquisition Costs, Capitalized							63
Dufresne Spencer Group industrial facility, Green Park, Missouri
Real Estate Acquisitions
Contract Purchase Price							10,000
Third Party Real Estate Acquisition Costs, Capitalized							63
Transcendia industrial facility, Greenville, South Carolina
Real Estate Acquisitions
Contract Purchase Price							6,830
Third Party Real Estate Acquisition Costs, Capitalized							$ 66
Forbo industrial facility, Huntersville, North Carolina
Real Estate Acquisitions
Contract Purchase Price								8,700
Third Party Real Estate Acquisition Costs, Capitalized								72
New mortgage debt	$ 5,190
Saddle Creek Logistics industrial facility, Pittston, Pennsylvania
Real Estate Acquisitions
Contract Purchase Price								11,750
Third Party Real Estate Acquisition Costs, Capitalized								199
New mortgage debt					$ 7,200
Corporate Woods industrial facility, Ankeny, Iowa
Real Estate Acquisitions
Contract Purchase Price								14,700
Third Party Real Estate Acquisition Costs, Capitalized								29
New mortgage debt						$ 8,820
Dufresne Spencer Group industrial facility, Memphis, Tennessee
Real Estate Acquisitions
Contract Purchase Price								8,000
Third Party Real Estate Acquisition Costs, Capitalized								$ 87

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- Definition

The amount of new mortgage loans obtained during the period.

+ References

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- Definition

The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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