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Partners Equity of The Operating Partnership (DetailsTextuals) (USD $) | 6 Months Ended | 12 Months Ended |  |  | 0 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended |
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 Series C Preferred Stock [Member] | Jun. 30, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dec. 31, 2011 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Jul. 19, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Jul. 05, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Jul. 16, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. 7.375% Series E Preferred Shares | Jun. 30, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. 7.375% Series E Preferred Shares | Jul. 16, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. 6.90% Series E-linked Preferred Units [Member] | Jun. 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 |  |  |  |  |  |  | $ 21,600,000 |  |  |  |  |
Percentage of Preferential return |  |  |  | 6.90% | 0.00% |  |  |  | 7.375% |  | 6.90% |
Dividends, Preferred Stock, Cash | 5,047,000 | 3,996,000 | 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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- Definition The aggregate amount of dividends declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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