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COMMITMENTS AND CONTINGENCIES (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
property
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
property
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jan. 31, 2015
USD ($)
Loss Contingencies [Line Items]            
Real estate redevelopment in process $ 199,400,000   $ 199,400,000      
Estimated cost to complete development and redevelopment projects 109,400,000   $ 109,400,000      
Development in process, estimated duration to complete     2 years      
Insurance coverage, general liability insurance, limit per occurrence 200,000,000   $ 200,000,000      
Insurance coverage, rental value insurance, limit per occurrence 500,000,000   500,000,000      
Insurance coverage, terrorism acts insurance, limit per occurrence 5,000,000   5,000,000      
Casualty and impairment loss 2,170,000 $ 0 5,637,000 $ 0    
Environmental remediation costs $ 1,232,000   $ 1,232,000   $ 1,309,000  
Number of properties with environmental contamination | property 2   2      
Cost of services, environmental remediation     $ 100,000      
Montehiedra Town Center and Las Catalinas Mall | Hurricane Maria | Puerto Rico            
Loss Contingencies [Line Items]            
Insurance coverage, rental value insurance, limit per occurrence $ 139,000,000   $ 139,000,000      
Loss contingency, estimated deductible for windstorm percentage 2.00%   2.00%      
Loss contingency, estimated recovery effort costs $ 6,500,000   $ 6,500,000      
Casualty and impairment loss 2,200,000          
Loss contingency, estimated deductible amount 2,500,000   2,500,000      
Cash advance from insurance 1,000,000          
Montehiedra Town Center and Las Catalinas Mall | Hurricane Maria | Puerto Rico | Accounts Payable and Accrued Expenses            
Loss Contingencies [Line Items]            
Cash advance from insurance 500,000          
Montehiedra Town Center and Las Catalinas Mall | Hurricane Maria | Puerto Rico | Property Rental            
Loss Contingencies [Line Items]            
Cash advance from insurance 500,000          
Mortgages            
Loss Contingencies [Line Items]            
Total mortgages payable $ 1,415,806,000   $ 1,415,806,000   1,205,560,000  
Mortgages | First Mortgage | Montehiedra Town Center            
Loss Contingencies [Line Items]            
Face amount of debt instrument           $ 120,000,000
Interest rate           6.04%
Mortgages | First Mortgage | Las Catalinas Mall            
Loss Contingencies [Line Items]            
Interest rate 4.434%   4.434%      
Total mortgages payable $ 130,000,000   $ 130,000,000   $ 130,000,000  
Mortgages | Non-recourse Mortgage | Montehiedra Town Center            
Loss Contingencies [Line Items]            
Total mortgages payable 116,400,000   116,400,000      
Mortgages | Non-recourse Mortgage | Las Catalinas Mall            
Loss Contingencies [Line Items]            
Total mortgages payable 130,000,000   130,000,000      
Intercompany Loans | Montehiedra Town Center            
Loss Contingencies [Line Items]            
Face amount of debt instrument $ 20,000,000   $ 20,000,000     $ 20,000,000