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REAL ESTATE INVESTMENTS - Amortization of In-Place Lease Origination Costs (Details) - USD ($)			12 Months Ended
	Feb. 24, 2020	Feb. 20, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amortization of origination costs associated with in-place leases
Purchase of real estate			$ 49,887,000	$ 80,290,000	$ 43,537,000
In-place leases
Amortization of origination costs associated with in-place leases
2020			4,157,000
2021			4,035,000
2022			3,577,000
2023			2,937,000
2024			1,845,000
Thereafter			6,488,000
Total			$ 23,039,000
Industrial Property Ashland, Virginia
Amortization of origination costs associated with in-place leases
Purchase of real estate		$ 9,100,000
Industrial Property Lowell, Arkansas
Amortization of origination costs associated with in-place leases
Purchase of real estate	$ 19,150,000

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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.

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