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RELATED PARTY TRANSACTIONS (Details) - USD ($)			1 Months Ended	12 Months Ended				36 Months Ended
	Oct. 31, 2016	Jan. 01, 2016	Oct. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016
Related Party Transaction
Share based compensation charged to operations					$ 2,983,000	$ 2,334,000	$ 1,833,000
Number of shares of common stock owned by the related party					17,600,000	16,292,000		17,600,000
Number of shares purchased by the related party under the dividend reinvestment plan					142,000	197,000	227,000
Deptford, New Jersey | Consolidated JV
Related Party Transaction
Purchase of Minority Interest Percentage	5.00%
Deptford, New Jersey | Consolidated JV | MCB Real Estate LLC And Its Affiliates
Related Party Transaction
Purchase of Minority Interest Percentage	5.00%		5.00%
Gould Investors L.P.
Related Party Transaction
Number of shares of common stock owned by the related party					1,785,976	1,785,976		1,785,976
Ownership percentage held by the related party					9.80%	10.60%		9.80%
Number of shares purchased by the related party under the dividend reinvestment plan						81,211	106,761
Amount of insurance reimbursed					$ 699,000	$ 520,000	$ 400,000
Real estate insurance expense					645,000	339,000	250,000
Majestic
Related Party Transaction
Annual fee paid in consideration for providing services				$ 1,519,000	2,504,000	2,339,000	2,669,000
Property management costs allocated to real estate expenses annually					1,057,000	892,500	850,000
Additional payment for the entity's share of all direct office expenses				216,000	196,000	196,000	186,000
Chairman
Related Party Transaction
Fee paid				276,000	262,500	262,500	250,000
Vice Chairman
Related Party Transaction
Fee paid				$ 110,000	105,000	105,000	100,000
Subsidiary of Gould
Related Party Transaction
Annual lease rent						7,000	42,000
Executive officers and others
Related Party Transaction
Share based compensation charged to operations					1,480,000	1,245,000	1,045,000
Joint venture partners
Related Party Transaction
Real estate management and acquisition costs					185,000	198,000	$ 262,000
Financing fee received						$ 131,000
Percentage of financing fees in Other Income						50.00%
Joint venture partners | Land and Building
Related Party Transaction
Real estate management and acquisition costs								$ 117,000
Corporate joint venture
Related Party Transaction
Aggregate fees paid to other partners					176,000	$ 409,000
Decrease in equity earnings, joint venture transaction					$ 88,000	$ 205,000
Net lease tenants | Majestic
Related Party Transaction
Property management fee (as a percent)		1.50%
Operating lease tenants | Majestic
Related Party Transaction
Property management fee (as a percent)		2.00%

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