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Partners Equity of The Operating Partnership (DetailsTextuals) (USD $) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2011 | Oct. 19, 2011 | Aug. 05, 2010
Partners Equity of The Operating Partnership (Textuals) [Abstract] |  |  |
Distribution Declared per common partnership unit |  | $ 0.15 |
Net proceeds contributed by Parent Company | $ 8,000,000 |  |
Issue of shares under Offering Program | 679,285 |  |
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
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Class F (2010) Units [Member] |  |  |
Partners Equity of The Operating Partnership (Textuals) [Abstract] |  |  |
Partnership units issued for acquisition |  |  | 7,111,112
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |
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 |
Common partnership units issued to the parent company | 679,285 |  |
7.375% Series E Preferred Shares [Member] |  |  |
Partners Equity of The Operating Partnership (Textuals) [Abstract] |  |  |
Distributions paid Preferred unitholders | 1,100,000 |  |
Percentage of Preferential return | 7.375% |  |
7.50% Series D Preferred Shares [Member] |  |  |
Partners Equity of The Operating Partnership (Textuals) [Abstract] |  |  |
Distributions paid Preferred unitholders | $ 900,000 |  |
Percentage of Preferential return | 7.50% |  |

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