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FAIR VALUE MEASUREMENTS - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 440,430 $ 490,279 $ 131,654 $ 168,983
Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 440,430 490,279    
Carrying Amount | Mortgages        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Mortgages payable 1,562,159 1,578,317    
Unamortized debt issuance costs (11,900) (13,800)    
Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 440,430 490,279    
Fair Value | Mortgages        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Mortgages payable $ 1,543,963 $ 1,579,839