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Partners Equity of the Operating Partnership (Textual) (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 11, 2018
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Common Partnership Unit [Line Items]      
Dividends, Common Stock   $ 32.5  
Dividends payable, date to be paid Oct. 18, 2018    
Dividends payable, date of record Oct. 04, 2018    
Dividend Declared [Member]      
Earnings Per Common Partnership Unit [Line Items]      
Dividends Payable, Amount Per Share $ 0.18    
BRANDYWINE OPERATING PARTNERSHIP, L.P.      
Earnings Per Common Partnership Unit [Line Items]      
Dividends, Common Stock $ 32.5    
Dividends payable, date to be paid Oct. 18, 2018    
Dividends payable, date of record Oct. 04, 2018    
Preferred units authorized   20,000,000 20,000,000
Preferred units outstanding   0 0
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dividend Declared [Member]      
Earnings Per Common Partnership Unit [Line Items]      
Dividends Payable, Amount Per Share $ 0.18