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SALES OF PROPERTIES (Details) - USD ($)														9 Months Ended	12 Months Ended
	Dec. 13, 2018	Sep. 14, 2018	Jan. 30, 2018	Nov. 14, 2017	Aug. 31, 2017	Jul. 14, 2017	May 08, 2017	Dec. 22, 2016	Jul. 05, 2016	Jun. 30, 2016	Jun. 15, 2016	May 19, 2016	Feb. 01, 2016	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 30, 2017
SALES OF PROPERTIES
Impairment loss															$ 0	$ 153,000
Joe's Crab Shack restaurant Ann Arbor, Michigan
SALES OF PROPERTIES
Impairment loss														$ 153,000
Sale of real estate
SALES OF PROPERTIES
Gross Sales Price															27,659,000	27,050,000	$ 43,363,000
Gain (loss) on Sale of Real Estate, Net															$ 5,262,000	$ 9,837,000	10,087,000
Sale of real estate | Retail Property, Fort Bend, Texas
SALES OF PROPERTIES
Gross Sales Price			$ 9,200,000
Gain (loss) on Sale of Real Estate, Net			2,408,000
Sale of real estate | Land, Lakemoor, Illinois
SALES OF PROPERTIES
Gross Sales Price		$ 8,459,000
Gain (loss) on Sale of Real Estate, Net		4,585,000
Fixed rental payment received and recorded as deferred income		$ 5,717,000																$ 5,906,000
Sale of real estate | Retail Property, Lincoln Nebraska
SALES OF PROPERTIES
Gross Sales Price	$ 10,000,000
Gain (loss) on Sale of Real Estate, Net	$ (1,731,000)
Sale of real estate | Retail property, Greenwood Village, Colorado
SALES OF PROPERTIES
Gross Sales Price							$ 9,500,000
Gain (loss) on Sale of Real Estate, Net							$ 6,568,000
Sale of real estate | Retail Property, Kansas City, Missouri
SALES OF PROPERTIES
Gross Sales Price						$ 10,250,000
Gain (loss) on Sale of Real Estate, Net						$ 2,180,000
Sale of real estate | Retail Property, Niles Illinois
SALES OF PROPERTIES
Gross Sales Price					$ 5,000,000
Gain (loss) on Sale of Real Estate, Net					$ 1,089,000
Sale of real estate | Restaurant property, Ann Arbor, Michigan
SALES OF PROPERTIES
Gross Sales Price				$ 2,300,000
Sale of real estate | Portfolio of eight retail properties, Louisiana and Mississippi
SALES OF PROPERTIES
Gross Sales Price													$ 13,750,000
Gain (loss) on Sale of Real Estate, Net													$ 787,000
Sale of real estate | Retail property, Killeen, Texas
SALES OF PROPERTIES
Gross Sales Price												$ 3,100,000
Gain (loss) on Sale of Real Estate, Net												$ 980,000
Sale of real estate | Land, Sandy Springs, Georgia
SALES OF PROPERTIES
Gross Sales Price											$ 8,858,000
Gain (loss) on Sale of Real Estate, Net											$ 2,331,000
Sale of real estate | Industrial property, Tomlinson, Pennsylvania
SALES OF PROPERTIES
Gross Sales Price										$ 14,800,000
Gain (loss) on Sale of Real Estate, Net										$ 5,660,000
Sale of real estate | Retail property, Island Park, NY
SALES OF PROPERTIES
Gross Sales Price								$ 2,702,000
Gain (loss) on Sale of Real Estate, Net								$ 213,000
Sale of real estate | Properties excluding Partial condemnation of land, Greenwood Village, Colorado
SALES OF PROPERTIES
Gross Sales Price																	43,210,000
Gain (loss) on Sale of Real Estate, Net																	$ 9,971,000
Sale of real estate | Partial condemnation of land, Greenwood Village, Colorado
SALES OF PROPERTIES
Gross Sales Price									$ 153,000
Gain (loss) on Sale of Real Estate, Net									$ 116,000
Non-Controlling Interests in Consolidated Joint Ventures | Sale of real estate | Retail Property, Fort Bend, Texas
SALES OF PROPERTIES
Non-controlling interest's share of the gain			$ 776,000
Consolidated Joint Venture | Sale of real estate | Retail Property, Fort Bend, Texas | Disposal Group, Disposed of by Sale, Not Discontinued Operations
SALES OF PROPERTIES
Ownership interest in consolidated joint venture of the company (as a percent)			85.00%

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

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