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FAIR VALUE MEASUREMENTS - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 384,572 $ 432,954 $ 440,430 $ 490,279
Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 384,572 432,954    
Carrying Amount | Mortgages        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Mortgages payable 1,597,397 1,556,248    
Unamortized debt issuance costs (9,900) (10,100)    
Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 384,572 432,954    
Fair Value | Mortgages        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Mortgages payable $ 1,611,868 $ 1,590,503