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ACQUISITIONS AND DISPOSITIONS - Summary of Acquisition Activity (Details) $ in Thousands									12 Months Ended
	May 24, 2018 USD ($) ft²	Feb. 28, 2018 USD ($) ft²	Feb. 23, 2018 USD ($) ft²	Jan. 26, 2018 USD ($) ft²	May 24, 2017 USD ($) ft²	Feb. 02, 2017 USD ($) ft²	Jan. 17, 2017 USD ($) ft²	Jan. 04, 2017 USD ($) ft²	Dec. 31, 2018 USD ($) ft²	Dec. 31, 2017 USD ($)	May 25, 2017 ft²
Business Acquisition [Line Items]
Square Feet | ft²									16,300,000
Purchase Price									$ 4,931	$ 463,669
Transaction costs									$ 100	$ 11,300
938 Spring Valley Road
Business Acquisition [Line Items]
Square Feet | ft²				2,000
Purchase Price				$ 719
116 Sunrise Highway
Business Acquisition [Line Items]
Square Feet | ft²			4,750
Purchase Price			$ 447
197 West Spring Valley Ave
Business Acquisition [Line Items]
Square Feet | ft²		16,000
Purchase Price		$ 2,799
7 Francis Place
Business Acquisition [Line Items]
Square Feet | ft²	3,000
Purchase Price	$ 966
Yonkers Gateway Center
Business Acquisition [Line Items]
Square Feet | ft²								0
Purchase Price								$ 51,902
Transaction costs								$ 200
Shops at Bruckner
Business Acquisition [Line Items]
Square Feet | ft²							114,000
Purchase Price							$ 32,269
Transaction costs							$ 300
Hudson Mall
Business Acquisition [Line Items]
Square Feet | ft²						383,000
Purchase Price						$ 44,273
Transaction costs						$ 600
Yonkers Gateway Center
Business Acquisition [Line Items]
Square Feet | ft²					437,000
Purchase Price					$ 101,825
The Plaza at Cherry Hill
Business Acquisition [Line Items]
Square Feet | ft²					413,000
Purchase Price					$ 53,535
Manchester Plaza
Business Acquisition [Line Items]
Square Feet | ft²					131,000
Purchase Price					$ 20,162
Millburn Gateway Center
Business Acquisition [Line Items]
Square Feet | ft²					102,000
Purchase Price					$ 45,583
21 E Broad St / One Lincoln Plaza
Business Acquisition [Line Items]
Square Feet | ft²					22,000
Purchase Price					$ 10,158
The Plaza at Woodbridge
Business Acquisition [Line Items]
Square Feet | ft²											411,000
Purchase Price					$ 103,962

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