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Partners Equity of the Operating Partnership (Details Textuals) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended |  | 0 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Sep. 30, 2013 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dec. 31, 2013 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Sep. 30, 2014 Class A Units [Member] | Sep. 30, 2013 Class A Units [Member] | Sep. 30, 2014 6.90% Series E-linked Preferred Units [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P. | Oct. 06, 2014 Dividend Paid [Member] | Oct. 06, 2014 Dividend Paid [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P. | Oct. 15, 2014 Dividend Paid [Member] 6.90% Series E-linked Preferred Units [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P. | Sep. 10, 2014 Dividend Declared [Member] | Sep. 10, 2014 Dividend Declared [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  | 1,721,905 | 1,763,739 |  |  |  |  |  |
Dividends Payable, Amount Per Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.15 | $ 0.15
Stock Issued During Period, Shares, New Issues | 21,850,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 335,016 | $ 181,527 |  | $ 335,016 | $ 181,527 |  |  |  |  |  |  |  |  |
Distributions payable | 28,857 |  | 25,584 | 28,857 |  | 25,584 |  |  |  | 27,200 | 27,200 |  |  |
Preferred Stock, Dividend Rate, Percentage | 6.90% |  | 6.90% | 6.90% |  | 6.90% |  |  | 6.90% |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  |
Dividends, Preferred Stock, Cash | $ 5,175 | $ 5,175 |  |  |  |  |  |  |  |  |  | $ 1,700 |  |

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