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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - evo at Cira Centre South Venture (Details)
$ in Thousands
12 Months Ended
Jan. 10, 2018
USD ($)
housing_unit
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]        
Proceeds from real estate venture sales   $ 9,730 $ 60,346 $ 145,416
Net gain on real estate venture transactions   $ 11,639 $ 142,233 $ 80,526
Evo At Cira Disposition [Member]        
Schedule of Equity Method Investments [Line Items]        
Sale of ownership interest percentage 50.00%      
Number of property units sold | housing_unit 345      
Sales Price $ 197,500      
Proceeds from real estate venture sales 43,000      
Cost of equity method investment 17,300      
Net gain on real estate venture transactions 25,700      
Philadelphia [Member] | Pennsylvania | Evo At Cira Disposition [Member]        
Schedule of Equity Method Investments [Line Items]        
Development costs contemplated debt financing $ 110,900