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Partners Equity of the Operating Partnership (Textual) (Details) - USD ($)
 12 Months Ended
Dec. 07, 2017
Apr. 11, 2017
Jan. 10, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 22, 2015
Earnings Per Common Partnership Unit [Line Items]              
Dividends, Common Stock $ 32,400,000            
Dividends payable, date to be paid Jan. 23, 2018            
Dividends payable, date of record Jan. 09, 2018            
Preferred share redemption charge       $ 3,181,000 $ 0 $ 0  
Authorized Amount             $ 100,000,000
Repurchased and Retired, Shares       0 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    
Common Stock, Shares Authorized       400,000,000 400,000,000    
Upfront costs       $ 499,000   $ 105,000  
Common shares issued under offering program         0 0  
Cash proceeds, net of issuance costs       $ 51,225,000 $ 0 $ 0  
Offering Program [Member]              
Earnings Per Common Partnership Unit [Line Items]              
Common Stock, Shares Authorized     16,000,000        
Upfront costs     $ 200,000        
Common shares issued under offering program       2,858,991 0 0  
Weighted average price per share       $ 18.19      
Cash proceeds, net of issuance costs       $ 51,200,000      
Common shares remain available for future issuance       13,141,009      
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 $ 32,400,000            
Dividends payable, date to be paid Jan. 23, 2018            
Dividends payable, date of record Jan. 09, 2018            
Preferred share redemption charge       $ 3,181,000 $ 0 $ 0  
Repurchase program, number of mirror unit retired for each common share repurchased       1      
Cash proceeds, net of issuance costs       $ 51,225,000 $ 0 $ 0  
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dividend Declared [Member]              
Earnings Per Common Partnership Unit [Line Items]              
Dividends Payable, Amount Per Share $ 0.18            
Class A Units [Member]              
Earnings Per Common Partnership Unit [Line Items]              
Redeemable Limited Partnership Units Potential Cash Redemption Value Closing Market Price       $ 18.19 $ 16.51 $ 13.66  
Limited Partners' Capital Account, Units Outstanding       1,479,799 1,479,799 1,535,102  
Series E Preferred Stock [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.              
Earnings Per Common Partnership Unit [Line Items]              
Redemption outstanding shares   4,000,000          
Redemption price per share   $ 25.51          
Accrued dividends paid in cash   $ 2,000,000          
Preferred share redemption charge   $ 3,200,000