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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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