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ACQUISITIONS AND DISPOSITIONS - Summary of Acquisition Activity (Details) $ in Thousands, shares in Millions				3 Months Ended		9 Months Ended
	Feb. 02, 2017 USD ($) ft²	Jan. 17, 2017 USD ($) ft²	Jan. 04, 2017 USD ($) shares	Sep. 30, 2017 USD ($) ft²	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) ft²	Sep. 30, 2016 USD ($)	May 25, 2017 USD ($) ft²	May 24, 2017 USD ($) ft²
Business Acquisition [Line Items]
Casualty and impairment loss				$ 2,170	$ 0	$ 5,637	$ 0
Area of Land (in sq ft/acres) | ft²				376,000		376,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net				$ 463,669		$ 463,669
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Liabilities				122,893		122,893
Purchase Price						463,669
Business acquisition, transaction costs				$ 11,300		$ 11,300
Yonkers Gateway Center
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares			1.8
Area of Land (in sq ft/acres) | ft²									437,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			$ 51,902
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Liabilities			14,655
Purchase Price			51,902
Business acquisition, transaction costs			$ 200
Yonkers Gateway Center (Ackerman) [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net									$ 101,825
Shops at Bruckner
Business Acquisition [Line Items]
Area of Land (in sq ft/acres) | ft²		114,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		$ 32,269
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Liabilities		12,709
Purchase Price		32,269
Business acquisition, transaction costs		$ 300
Hudson Mall
Business Acquisition [Line Items]
Area of Land (in sq ft/acres) | ft²	383,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 44,273
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Liabilities	17,344
Purchase Price	44,273
Business acquisition, transaction costs	$ 600
The Plaza at Cherry Hill
Business Acquisition [Line Items]
Area of Land (in sq ft/acres) | ft²									413,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net									$ 53,535
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Liabilities									$ 2,533
Manchester Plaza
Business Acquisition [Line Items]
Area of Land (in sq ft/acres) | ft²									131,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net									$ 20,162
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Liabilities									$ 1,259
Millburn Gateway Center
Business Acquisition [Line Items]
Area of Land (in sq ft/acres) | ft²									102,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net									$ 45,583
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Liabilities									$ 947
21 E Broad St / One Lincoln Plaza
Business Acquisition [Line Items]
Area of Land (in sq ft/acres) | ft²									22,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net									$ 10,158
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Liabilities									$ 554
The Plaza at Woodbridge
Business Acquisition [Line Items]
Area of Land (in sq ft/acres) | ft²								411,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net								$ 103,962
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Liabilities								$ 4,198

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