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Partners' Equity Of The Parent Company - Textual (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Feb. 24, 2021
USD ($)
$ / shares
Mar. 31, 2021
Mar. 31, 2020
USD ($)
$ / shares
shares
Earnings Per Common Partnership Unit [Line Items]      
Dividends, common stock | $ $ 32,800    
Shares repurchased and retired (in shares) | shares     5,644,200
Share price (in dollars per share) | $ / shares     $ 9.54
Value of stock repurchased and retired | $     $ 53,858
Dividend declared      
Earnings Per Common Partnership Unit [Line Items]      
Dividends payable (in dollars per share) | $ / 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 share) | $ / shares $ 0.19