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ACQUISITIONS AND DISPOSITIONS - Additional Information (Details)
$ / shares in Units, ft² in Thousands, $ in Thousands, shares in Millions
 12 Months Ended
Jul. 05, 2018
USD ($)
Sep. 08, 2017
USD ($)
May 25, 2017
USD ($)
ft²
$ / shares
shares
Feb. 02, 2017
USD ($)
ft²
Jan. 17, 2017
USD ($)
ft²
Jan. 04, 2017
USD ($)
ft²
$ / shares
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Apr. 23, 2018
USD ($)
Jun. 30, 2017
USD ($)
Business Acquisition [Line Items]                        
Area of real estate property (in sq ft) | ft²               16,300        
Business acquisition, transaction costs               $ 100 $ 11,300      
Income from acquired leasehold interest               0 39,215 $ 0    
Business acquisition, consideration paid               4,931 463,669      
Impairment loss on real estate               5,574 5,637 0    
Gain on sale of real estate               52,625 202 $ 15,618    
Eatontown, NJ | Disposal Group, Disposed of by Sale, Not Discontinued Operations                        
Business Acquisition [Line Items]                        
Impairment loss on real estate                 3,500      
Consideration received on sale of real estate part of disposal group                       $ 4,800
Kearny, NJ | Disposal Group, Disposed of by Sale, Not Discontinued Operations                        
Business Acquisition [Line Items]                        
Consideration received on sale of real estate part of disposal group   $ 300                    
Gain on sale of real estate   $ 200                    
Allentown, PA | Disposal Group, Disposed of by Sale, Not Discontinued Operations                        
Business Acquisition [Line Items]                        
Consideration received on sale of real estate part of disposal group                     $ 54,300  
Gain on sale of real estate               50,400        
West Babylon, NY | Disposal Group, Held-for-sale, Not Discontinued Operations                        
Business Acquisition [Line Items]                        
Impairment loss on real estate               $ 2,500        
Yonkers Gateway Center                        
Business Acquisition [Line Items]                        
Cash acquisition price           $ 2,900            
Area of real estate property (in sq ft) | ft²           0            
Business acquisition, equity interest issued or issuable, value           $ 48,800            
Business acquisition, equity interest issued or issuable, units (in shares) | shares           1.8            
Business acquisition, unit price (in dollars per share) | $ / shares           $ 27.09            
Business acquisition, transaction costs           $ 200            
Business acquisition, consideration paid           $ 51,902            
Shops at Bruckner                        
Business Acquisition [Line Items]                        
Cash acquisition price         $ 19,400              
Area of real estate property (in sq ft) | ft²         114              
Business acquisition, transaction costs         $ 300              
Income from acquired leasehold interest                 $ 39,200      
Business acquisition, consideration paid         32,269              
Shops at Bruckner | Mortgages                        
Business Acquisition [Line Items]                        
Business acquisition, debt assumed         $ 12,600              
Hudson Mall                        
Business Acquisition [Line Items]                        
Cash acquisition price       $ 19,900                
Area of real estate property (in sq ft) | ft²       383                
Business acquisition, transaction costs       $ 600                
Business acquisition, consideration paid       44,273                
Hudson Mall | Mortgages                        
Business Acquisition [Line Items]                        
Business acquisition, debt assumed       $ 23,800                
Ackerman Portfolio                        
Business Acquisition [Line Items]                        
Cash acquisition price     $ 44,000                  
Business acquisition, equity interest issued or issuable, value     $ 122,000                  
Business acquisition, equity interest issued or issuable, units (in shares) | shares     4.5                  
Business acquisition, unit price (in dollars per share) | $ / shares     $ 27.02                  
Business acquisition, transaction costs     $ 10,200                  
Business acquisition, debt assumed     $ 33,000                  
Area of land (in sq ft/acres) | ft²     1,500                  
Business acquisition, consideration paid     $ 325,000                  
Percentage of leased area     83.00%                  
Ackerman Portfolio | Mortgages                        
Business Acquisition [Line Items]                        
Business acquisition, non-recourse debt issued     $ 126,000                  
Office Building in Maywood, NJ | Scenario, Forecast                        
Business Acquisition [Line Items]                        
Business acquisition, consideration paid             $ 7,100          
Kearny, NJ | Excess Land Cherry Hill, NJ | Disposal Group, Disposed of by Sale, Not Discontinued Operations                        
Business Acquisition [Line Items]                        
Consideration received on sale of real estate part of disposal group $ 3,300                      
Gain on sale of real estate $ 2,200