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Partners Equity of The Operating Partnership (DetailsTextuals) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  |  | 0 Months Ended |  |  | 12 Months Ended | 0 Months Ended |
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Aug. 05, 2010 | Dec. 31, 2011 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dec. 13, 2011 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Feb. 27, 2004 BRANDYWINE OPERATING PARTNERSHIP, L.P. 7.375% Series E Preferred Shares | Dec. 31, 2011 BRANDYWINE OPERATING PARTNERSHIP, L.P. 7.375% Series E Preferred Shares | Dec. 31, 2010 BRANDYWINE OPERATING PARTNERSHIP, L.P. 7.375% Series E Preferred Shares | Dec. 30, 2003 BRANDYWINE OPERATING PARTNERSHIP, L.P. 7.50% Series D Preferred Shares | Dec. 31, 2011 BRANDYWINE OPERATING PARTNERSHIP, L.P. 7.50% Series D Preferred Shares | Dec. 31, 2010 BRANDYWINE OPERATING PARTNERSHIP, L.P. 7.50% Series D Preferred Shares | Dec. 31, 2011 Class A Units | Dec. 31, 2010 Class A Units | Dec. 23, 2011 Class F (2010) Units | Aug. 05, 2010 Class F (2010) Units BRANDYWINE OPERATING PARTNERSHIP, L.P. | Jan. 19, 2012 Dividend Declared | Dec. 31, 2011 Dividend Declared 7.375% Series E Preferred Shares | Dec. 31, 2011 Dividend Declared 7.50% Series D Preferred Shares | Jan. 17, 2012 Dividend Paid 7.375% Series E Preferred Shares | Jan. 17, 2012 Dividend Paid 7.50% Series D Preferred Shares | Jan. 19, 2012 Dividend Paid BRANDYWINE OPERATING PARTNERSHIP, L.P.
Partners Equity of The Operating Partnership (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred units, shares issued |  |  |  |  |  |  | 2,300,000 | 2,300,000 | 2,300,000 | 2,000,000 | 2,000,000 | 2,000,000 |  |  |  |  |  |  |  |  |  |
Preferred units, aggregate liquidation preference |  |  |  |  |  |  | $ 57.5 |  |  | $ 50.0 |  |  |  |  |  |  |  |  |  |  |  |
Preferred units, liquidation preference per unit |  |  |  |  |  |  | $ 25 |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Preferential return |  |  |  |  |  |  | 7.375% | 7.375% | 7.375% | 7.50% | 7.50% | 7.50% |  |  |  |  |  | 7.375% | 7.50% |  |  |
Redeemable limited partnership units potential cash redemption value based on closing market price | $ 9.50 | $ 11.65 | $ 11.40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partners capital account, units outstanding |  |  |  |  |  |  |  |  |  |  |  |  | 2,698,647 | 2,791,640 |  |  |  |  |  |  |  |
Distribution Declared per common partnership unit |  |  |  |  |  | $ 0.15 |  |  |  |  |  |  |  |  |  |  | $ 0.15 |  |  |  |  |
Distribution Declared for common partnership unitholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21.5
Distributions paid Preferred unitholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.1 | 0.9 |
Net proceeds contributed by Parent Company | $ 8.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of shares under Offering Program | 679,285 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common partnership units issued to the parent company |  |  |  |  | 679,285 |  |  |  |  |  |  |  |  |  | 7,111,112 |  |  |  |  |  |  |
Partnership units issued for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,111,112 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Partnership Units Issued | 6,421,553 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining shares available for sales | 8,578,447 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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