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Partners Equity of the Operating Partnership (Textual) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 09, 2016 | Mar. 31, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |
Distributions payable |  | $ 28,295 | $ 28,249
Preferred Stock, Dividend Rate, Percentage |  | 6.90% | 6.90%
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |
Class of Stock [Line Items] |  |  |
Distributions payable |  | $ 28,295 | $ 28,249
Preferred Stock, Dividend Rate, Percentage |  | 6.90% | 6.90%
Dividend Declared [Member] |  |  |
Class of Stock [Line Items] |  |  |
Dividends Payable, Amount Per Share | $ 0.15 |  |
Dividend Declared [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |
Class of Stock [Line Items] |  |  |
Dividends Payable, Amount Per Share | $ 0.15 |  |
Dividend Paid [Member] |  |  |
Class of Stock [Line Items] |  |  |
Distributions payable |  | $ 26,600 |
Dividend Paid [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |
Class of Stock [Line Items] |  |  |
Distributions payable |  | $ 26,600 |
6.90% Series E-linked Preferred Units [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 6.90% |
Preferred Stock, Liquidation Preference Per Share |  | $ 25.00 |
6.90% Series E-linked Preferred Units [Member] | Dividend Paid [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |
Class of Stock [Line Items] |  |  |
Dividends, Preferred Stock, Cash | $ 1,700 |  |

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