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VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - Consolidated Joint Ventures (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)
Consolidated VIEs Carrying Amount of Assets and Liabilities
Land	$ 195,320,000	$ 204,162,000
Unbilled rent receivable	15,037,000	13,722,000
Unamortized intangible lease assets, net	26,068,000	26,541,000
Escrow, deposits, and other assets and receivables	10,894,000	8,023,000
Mortgages payable, net of unamortized deferred financing costs of $313 and $391, respectively	435,840,000	418,798,000
Accrued expenses and other liabilities	14,587,000	11,094,000
Unamortized intangible lease liabilities, net	12,421,000	14,013,000
Accumulated other comprehensive (loss) income	(1,623,000)	1,890,000
Non-controlling interests in consolidated joint ventures	$ 1,221,000	1,449,000
Consolidated Joint Venture-VIEs
Variable Interest Entities
Number of joint ventures with controlling interest | item	4
Consolidated VIEs Carrying Amount of Assets and Liabilities
Land	$ 12,158,000	14,722,000
Buildings and improvements, net of accumulated depreciation of $4,334 and $4,119, respectively	24,223,000	27,642,000
Accumulated depreciation	4,334,000	4,119,000
Cash	888,000	1,020,000
Unbilled rent receivable	859,000	1,211,000
Unamortized intangible lease assets, net	745,000	890,000
Escrow, deposits, and other assets and receivables	1,204,000	810,000
Mortgages payable, net of unamortized deferred financing costs of $313 and $391, respectively	24,199,000	26,850,000
Unamortized deferred financing costs	313,000	391,000
Accrued expenses and other liabilities	562,000	761,000
Unamortized intangible lease liabilities, net	591,000	1,694,000
Accumulated other comprehensive (loss) income	(65,000)	31,000
Non-controlling interests in consolidated joint ventures	$ 1,221,000	$ 1,449,000
Consolidated Joint Venture-VIEs | Minimum
Variable Interest Entities
Ownership interest in consolidated joint venture of the company (as a percent)	90.00%
Consolidated Joint Venture-VIEs | Maximum
Variable Interest Entities
Ownership interest in consolidated joint venture of the company (as a percent)	95.00%
Consolidated Joint Venture-VIEs | Real Estate in Clemmons, NC
Variable Interest Entities
Ownership interest in consolidated joint venture of the company (as a percent)		90.00%

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The parent entity's controlling interest held in a consolidated entity, expressed as a percentage.

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