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Partners Equity of The Operating Partnership (DetailsTextuals) (USD $) | 9 Months Ended |  | 9 Months Ended | 12 Months Ended |  |  |  | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended |
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Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011 | Sep. 30, 2012 Series C Preferred Stock [Member] | Sep. 30, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dec. 31, 2011 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Oct. 19, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Oct. 05, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Sep. 30, 2011 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Oct. 16, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. 7.375% Series E Preferred Shares | Sep. 30, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. 7.375% Series E Preferred Shares | Oct. 16, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. 6.90% Series E-linked Preferred Units [Member] | Sep. 30, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. 6.90% Series E-linked Preferred Units [Member] | Aug. 05, 2010 BRANDYWINE OPERATING PARTNERSHIP, L.P. Class F (2010) Units
Partners Equity of The Operating Partnership (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Declared per common partnership unit |  |  |  |  |  |  | $ 0.15 |  |  |  |  |  |  |
Dividends Payable, Amount | $ 24,820,000 | $ 23,505,000 | $ 23,895,000 |  | $ 24,820,000 | $ 23,895,000 |  | $ 21,600,000 | $ 23,505,000 |  |  |  |  |
Percentage of Preferential return |  |  |  |  | 6.90% | 0.00% |  |  |  |  | 7.375% |  | 6.90% |
Dividends, Preferred Stock, Cash | 7,832,000 | 5,994,000 |  | 200,000 |  |  |  |  |  | 1,100,000 |  | 1,800,000 |  |
Partnership units issued for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,111,112
Market price of shares on acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.54
Dividend rate |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.60

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