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Partners Equity of the Operating Partnership Partners Equity of the Operating Partnership (Details Textuals) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 15, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Oct. 19, 2015 | Sep. 15, 2015
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |
Distributions Payable |  | $ 28,318 |  | $ 28,871 |  |
Preferred Stock, Dividend Rate, Percentage |  | 6.90% |  | 6.90% |  |
Dividends, Preferred Stock, Cash |  | $ 5,175 | $ 5,175 |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |
Distributions Payable |  | $ 28,318 |  | $ 28,871 |  |
Preferred Stock, Dividend Rate, Percentage |  | 6.90% |  | 6.90% |  |
6.90% Series E-linked Preferred Units [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 6.90% |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  | $ 25.00 |  |  |  |
Dividend Paid [Member] | Subsequent Event [Member] |  |  |  |  |  |
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |
Distributions Payable |  |  |  |  | $ 26,600 |
Dividend Paid [Member] | Subsequent Event [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |
Distributions Payable |  |  |  |  | $ 26,600 |
Dividend Paid [Member] | Subsequent Event [Member] | 6.90% Series E-linked Preferred Units [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |
Dividends, Preferred Stock, Cash | $ 1,700 |  |  |  |  |
Dividend Declared [Member] |  |  |  |  |  |
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |
Dividends Payable, Amount Per Share |  |  |  |  |  | $ 0.15
Dividend Declared [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |
Dividends Payable, Amount Per Share |  |  |  |  |  | $ 0.15

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