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SALES OF PROPERTIES AND IMPAIRMENT LOSS (Details)		1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Jan. 30, 2018 USD ($)	Jan. 31, 2015 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) property	Dec. 31, 2015 USD ($)
Sale of Properties
Net Sales price					$ 27,050,000	$ 43,363,000
Gain on Sales of Real Estate, Net					9,837,000	10,087,000
Total sales price, net of closing costs					26,301,000	42,312,000	$ 16,025,000
Mortgage loan paid off					12,936,000	63,726,000	27,967,000
Impairment loss					153,000
Retail property, Greenwood Village, Colorado
Sale of Properties
Net Sales price					9,500,000
Gain on Sales of Real Estate, Net					6,568,000
Retail Property, Kansas City, Missouri
Sale of Properties
Net Sales price					10,250,000
Gain on Sales of Real Estate, Net					2,180,000
Retail Property, Niles Illinois
Sale of Properties
Net Sales price					5,000,000
Gain on Sales of Real Estate, Net					1,089,000
Restaurant property, Ann Arbor, Michigan
Sale of Properties
Net Sales price					$ 2,300,000
Portfolio of eight retail properties, Louisiana and Mississippi
Sale of Properties
Net Sales price						13,750,000
Gain on Sales of Real Estate, Net						$ 787,000
Number of real estate properties sold | property						8
Retail property, Killeen, Texas
Sale of Properties
Net Sales price						$ 3,100,000
Gain on Sales of Real Estate, Net						980,000
Land, Sandy Springs, Georgia
Sale of Properties
Net Sales price						8,858,000
Gain on Sales of Real Estate, Net						2,331,000
Industrial property, Tomlinson, Pennsylvania
Sale of Properties
Net Sales price						14,800,000
Gain on Sales of Real Estate, Net						5,660,000
Retail property, Island Park, NY
Sale of Properties
Net Sales price						2,702,000
Gain on Sales of Real Estate, Net						213,000
Properties excluding Partial condemnation of land, Greenwood Village, Colorado
Sale of Properties
Net Sales price						43,210,000
Gain on Sales of Real Estate, Net						9,971,000
Partial condemnation of land, Greenwood Village, Colorado
Sale of Properties
Net Sales price						153,000
Gain on Sales of Real Estate, Net						$ 116,000
Property located in Cherry Hill, NJ | Consolidated JV | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Sale of Properties
Gain on Sales of Real Estate, Net							$ 5,392,000
Total sales price, net of closing costs		$ 16,025,000
Mortgage balance paid off		7,376,000
Swap termination expense		472,000
Property located in Cherry Hill, NJ | Consolidated JV | Non-Controlling Interests in Consolidated Joint Ventures | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Sale of Properties
Non-controlling interest's share of the gain from the transaction		$ 1,320,000
Property located in Fort Bend, Texas | Consolidated JV | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Sale of Properties
Net Sales price	$ 9,000,000
Gain on Sales of Real Estate, Net			$ 2,400,000
Ownership percentage	85.00%
Mortgage loan paid off	$ 4,400,000
Rental revenue to property accounted percentage					1.20%	1.20%	1.20%
Property located in Fort Bend, Texas | Consolidated JV | Non-Controlling Interests in Consolidated Joint Ventures | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Sale of Properties
Non-controlling interest's share of the gain from the transaction	$ 800,000
Joe's Crab Shack restaurant Ann Arbor, Michigan
Sale of Properties
Impairment loss				$ 153,000

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Represents the number of real estate investments sold by the entity during the period.

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The percentage of property accounted for less than of the Company's rental income.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Gross amount of debt extinguished.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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Amount after tax of income (loss) from a discontinued operation attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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Revenue from the sale of commercial, industrial, or residential property during the period. This element is more likely than not relevant to an entity for which real estate operations are a principal activity. If real estate operations are not a principal activity, the reporting entity would likely use a gain (loss) on sale of property, plant, or equipment type element.

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