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Partners Equity of the Operating Partnership (Textual) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Feb. 27, 2020
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Common Partnership Unit [Line Items]      
Dividends, common stock $ 32,700    
Shares repurchased and retired (in shares)   5,644,200 1,337,169
Share price (in dollars per share)   $ 9.54 $ 12.92
Value of stock repurchased and retired   $ 53,858 $ 17,281
Dividend declared      
Earnings Per Common Partnership Unit [Line Items]      
Dividends payable (in dollars per share) $ 0.19    
BRANDYWINE OPERATING PARTNERSHIP, L.P.      
Earnings Per Common Partnership Unit [Line Items]      
Dividends, common stock $ 32,700    
Repurchase program, number 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) $ 0.19