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FAIR VALUE MEASUREMENTS - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 380,395 $ 131,654 $ 149,698 $ 168,983
Mortgages        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Unamortized debt issuance costs (7,740) (8,047)    
Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 380,395 131,654    
Mortgages payable 1,415,806 1,205,560    
Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 380,395 131,654    
Mortgages payable $ 1,432,817 $ 1,216,989