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Partners Equity of the Operating Partnership (Textual) (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 06, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Jul. 22, 2015 | Dec. 31, 2014
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Distributions payable |  | $ 30,032,000 | $ 28,249,000 |  | $ 28,871,000
Preferred Stock, Dividend Rate, Percentage |  | 6.90% | 6.90% |  |
Authorized Amount |  |  |  | $ 100,000,000 |
Number of Shares Authorized to be Repurchased |  |  |  | 539,200 |
Repurchased and Retired, Shares |  | 0 | 5,209,437 |  |
Share Price |  |  | $ 12.90 |  |
Repurchased and Retired, Value |  |  | $ 67,325,000 |  |
Common Stock, Par or Stated Value Per Share (USD per share) |  | $ 0.01 | $ 0.01 |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Distributions payable |  | $ 30,032,000 | $ 28,249,000 |  | $ 28,871,000
Preferred Stock, Dividend Rate, Percentage |  | 6.90% | 6.90% |  |
Repurchase program, number of mirror unit retired for each common share repurchased |  | 1 |  |  |
Dividend Declared [Member] |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Dividends Payable, Amount Per Share | $ 0.16 |  |  |  |
Dividend Declared [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Dividends Payable, Amount Per Share | $ 0.16 |  |  |  |
Dividend Paid [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Distributions payable |  | $ 28,100,000 |  |  |
Class A Units [Member] |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Redeemable Limited Partnership Units Potential Cash Redemption Value Closing Market Price |  | $ 16.51 | $ 13.66 |  | $ 15.98
Limited Partners' Capital Account, Units Outstanding |  | 1,479,799 | 1,535,102 |  | 1,535,102
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 |  |  |
6.90% Series E-linked Preferred Units [Member] | Dividend Paid [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Dividends, Preferred Stock, Cash | $ 1,700,000 |  |  |  |

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