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Partners' Equity Of The Parent Company - Textual (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 14, 2021
USD ($)
$ / shares
May 18, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2021
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Earnings Per Common Partnership Unit [Line Items]            
Dividends, common stock | $ $ 32,800          
Shares repurchased and retired (in units) | shares         0 6,248,483
Share price (in dollars per unit) | $ / shares           $ 9.60
Value of stock repurchased and retired | $     $ 6,141 $ 53,858   $ 60,000
Shelf Registration            
Earnings Per Common Partnership Unit [Line Items]            
Number of shares issued (in units) | shares         226,695  
One and Two Commerce Square            
Earnings Per Common Partnership Unit [Line Items]            
Percent of noncontrolling interest acquired         1.00%  
Dividend declared            
Earnings Per Common Partnership Unit [Line Items]            
Dividends payable (in dollars per unit) | $ / shares $ 0.19          
BRANDYWINE OPERATING PARTNERSHIP, L.P.            
Earnings Per Common Partnership Unit [Line Items]            
Dividends, common stock | $   $ 32,800        
Repurchase program, ratio of mirror unit of operating partnership retired for each common share repurchased         1  
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dividend declared            
Earnings Per Common Partnership Unit [Line Items]            
Dividends payable (in dollars per unit) | $ / shares   $ 0.19