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Partners Equity of the Operating Partnership (Textual) (Details) - USD ($)
 12 Months Ended
Dec. 06, 2016
Dec. 31, 2016
Dec. 31, 2015
Jul. 22, 2015
Dec. 31, 2014
Earnings Per Common Partnership Unit [Line Items]          
Distributions payable   $ 30,032,000 $ 28,249,000   $ 28,871,000
Preferred Stock, Dividend Rate, Percentage   6.90% 6.90%    
Authorized Amount       $ 100,000,000  
Number of Shares Authorized to be Repurchased       539,200  
Repurchased and Retired, Shares   0 5,209,437    
Share Price     $ 12.90    
Repurchased and Retired, Value     $ 67,325,000    
Common Stock, Par or Stated Value Per Share (USD per share)   $ 0.01 $ 0.01    
BRANDYWINE OPERATING PARTNERSHIP, L.P.          
Earnings Per Common Partnership Unit [Line Items]          
Distributions payable   $ 30,032,000 $ 28,249,000   $ 28,871,000
Preferred Stock, Dividend Rate, Percentage   6.90% 6.90%    
Repurchase program, number of mirror unit retired for each common share repurchased   1      
Dividend Declared [Member]          
Earnings Per Common Partnership Unit [Line Items]          
Dividends Payable, Amount Per Share $ 0.16        
Dividend Declared [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.          
Earnings Per Common Partnership Unit [Line Items]          
Dividends Payable, Amount Per Share $ 0.16        
Dividend Paid [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.          
Earnings Per Common Partnership Unit [Line Items]          
Distributions payable   $ 28,100,000      
Class A Units [Member]          
Earnings Per Common Partnership Unit [Line Items]          
Redeemable Limited Partnership Units Potential Cash Redemption Value Closing Market Price   $ 16.51 $ 13.66   $ 15.98
Limited Partners' Capital Account, Units Outstanding   1,479,799 1,535,102   1,535,102
6.90% Series E-linked Preferred Units [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.          
Earnings Per Common Partnership Unit [Line Items]          
Preferred Stock, Dividend Rate, Percentage   6.90%      
Preferred Stock, Liquidation Preference Per Share   $ 25.00      
6.90% Series E-linked Preferred Units [Member] | Dividend Paid [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.          
Earnings Per Common Partnership Unit [Line Items]          
Dividends, Preferred Stock, Cash $ 1,700,000