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Partners Equity of The Operating Partnership (DetailsTextuals) (USD $)
 6 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2011
Aug. 05, 2010
Aug. 05, 2010
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Class F (2010) Units [Member]
Jun. 30, 2011
BRANDYWINE OPERATING PARTNERSHIP, L.P.
May 31, 2011
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Jun. 30, 2011
7.50% Series D Preferred Shares
Jun. 30, 2011
7.375% Series E Preferred Shares
Partners Equity of The Operating Partnership (Textuals) [Abstract]              
Distribution Declared per common partnership unit         $ 0.15    
Distribution Declared for common partnership unitholders         $ 20,500,000    
Distributions paid Preferred unitholders           900,000 1,100,000
Preferential return for series C 7.50%            
Preferential return for series D 7.375%            
Net proceeds contributed by Parent Company 8,000,000            
Issue of shares under Offering Program 679,285            
Common partnership units issued to the parent company       679,285      
Partnership units issued for acquisition     7,111,112        
Market price of shares on acquisition date   11.54          
Dividend rate   $ 0.60          
Redemption price of partnership unit   Either for an amount, per unit, of cash equal to the market price of one of the Parent Company’s common share (based on the five-day trading average ending on the date of the exchange) or for one of the Parent Company’s common share