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MORTGAGES PAYABLE - Additional Information (Details)
12 Months Ended
Mar. 07, 2017
USD ($)
extension_option
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Feb. 23, 2018
USD ($)
Jan. 15, 2015
USD ($)
Debt Instrument [Line Items]            
Net carrying amount of real estate collateralizing indebtedness   $ 1,300,000,000        
Gain (loss) on extinguishment of debt   2,524,000 $ (35,336,000) $ 0    
Increase in credit facility $ 100,000,000          
Revolving Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 600,000,000          
Revolving Credit Facility | Revolving Credit Agreement            
Debt Instrument [Line Items]            
Maximum borrowing capacity           $ 500,000,000
Number of extension options | extension_option 2          
Term of each extension option 6 months          
Amounts drawn under credit facility   0        
Borrowing rate 1.15%          
Facility fee 200.00%          
Gross debt issuance costs   2,200,000 3,200,000      
Revolving Credit Facility | Revolving Credit Agreement | Maximum            
Debt Instrument [Line Items]            
Financial covenants, maximum leverage ratio           0.6
Facility fee 35.00%          
Revolving Credit Facility | Revolving Credit Agreement | Minimum            
Debt Instrument [Line Items]            
Financial covenants, minimum fixed charge coverage ratio 1.5          
Facility fee 15.00%          
Revolving Credit Facility | Revolving Credit Agreement | LIBOR | Maximum            
Debt Instrument [Line Items]            
Interest rate spread on variable rate 1.55%          
Revolving Credit Facility | Revolving Credit Agreement | LIBOR | Minimum            
Debt Instrument [Line Items]            
Interest rate spread on variable rate 1.10%          
First Mortgage | Mortgages            
Debt Instrument [Line Items]            
Total mortgages payable   1,562,159,000 1,578,317,000      
First Mortgage | Mortgages | Fixed rate            
Debt Instrument [Line Items]            
Total mortgages payable   1,392,659,000 1,408,817,000      
First Mortgage | Mortgages | Englewood, NJ | Fixed rate            
Debt Instrument [Line Items]            
Gain (loss) on extinguishment of debt   2,500,000        
Total mortgages payable   $ 0 $ 11,537,000   $ 11,500,000  
Borrowing rate   0.00%