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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - PJP Ventures (Details)
$ in Thousands
12 Months Ended
Oct. 29, 2019
USD ($)
ft²
property
Dec. 31, 2020
USD ($)
ft²
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]        
Area of real estate property | ft²   13,852,464    
Proceeds from the sale of properties   $ 278,114 $ 41,795 $ 324,090
Net gain on real estate venture transactions   $ 75 $ 11,639 $ 142,233
Charlottesville VA | PJP II, PJP VII, And PJP VII        
Schedule of Equity Method Investments [Line Items]        
Number of properties contributed to a joint venture | property 3      
Area of real estate property | ft² 204,347      
Sales price $ 51,000      
Proceeds from the sale of properties 9,100      
Net gain on real estate venture transactions $ 8,000      
Minimum | Charlottesville VA | PJP II, PJP VII, And PJP VII        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage 25.00%      
Maximum | Charlottesville VA | PJP II, PJP VII, And PJP VII        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage 30.00%