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ACQUISITIONS AND DISPOSITIONS (Details) $ in Thousands		3 Months Ended
	Feb. 12, 2020 USD ($)	Mar. 31, 2020 USD ($) property	Mar. 31, 2019 USD ($)	Mar. 15, 2020 USD ($)
Business Acquisition [Line Items]
Purchase price		$ 167,289
Number of acquisitions completed by the Company		0
Gain on sale of real estate		$ 39,775	$ 16,953
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Number of disposed properties | property		3
Aggregate sale price of disposed properties		$ 58,100
Gain on sale of real estate		(39,800)
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Chicopee, MA
Business Acquisition [Line Items]
Gain on sale of real estate		(17,000)
Disposal group, including discontinued operation, consideration				$ 18,200
Kingswood Center And Kingswood Crossing
Business Acquisition [Line Items]
Purchase price		167,300
Purchase price of real estate property acquired		167,289
Kingswood Center
Business Acquisition [Line Items]
Purchase price		90,212
Purchase price of real estate property acquired	$ 90,212
Kingswood Crossing
Business Acquisition [Line Items]
Purchase price		$ 77,077
Purchase price of real estate property acquired	$ 77,077
Reverse Section 1031 like-kind exchange, term		180 days
Mortgages | Kingswood Center
Business Acquisition [Line Items]
Mortgage loan related to property sales		$ 65,500

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