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Partners Equity of the Operating Partnership (Textual) (Details) - USD ($) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 08, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Jul. 22, 2015 | Dec. 31, 2013 | Nov. 05, 2013
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |
Distributions payable |  | $ 28,249,000 | $ 28,871,000 |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 6.90% | 6.90% |  |  |
Shares Authorized For Equity Offering Program |  |  |  |  |  | 16,000,000
Authorized Amount |  |  |  | $ 100,000,000 |  |
Number of Shares Authorized to be Repurchased |  |  |  | 539,200 |  |
Repurchased and Retired, Shares |  | 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 |  | $ 28,249,000 | $ 28,871,000 |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 6.90% | 6.90% |  |  |
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 |  |  |  |  |
Dividend Paid [Member] |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |
Distributions payable |  | $ 26,500,000 |  |  |  |
Dividend Paid [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |
Distributions payable |  | $ 26,500,000 |  |  |  |
Class A Units [Member] |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |
Redeemable Limited Partnership Units Potential Cash Redemption Value Closing Market Price |  | $ 13.66 | $ 15.98 |  | $ 14.09 |
Limited Partners' Capital Account, Units Outstanding |  | 1,535,102 | 1,535,102 |  | 1,763,739 |
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 |  |  |  |  |
Offering Program [Member] |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |
Remaining Shares Available For Sales |  | 16,000,000 |  |  |  |
Offering Program [Member] | Maximum [Member] |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |
Fees and Commissions Percentage |  | 2.00% |  |  |  |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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