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Beneficiaries Equity of the Parent Company (Textuals) (Details) - USD ($) |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 08, 2015 | Aug. 01, 2014 | Apr. 10, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jul. 22, 2015 | Nov. 05, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Distributions payable |  |  |  | $ 28,249,000 | $ 28,871,000 |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 6.90% | 6.90% |  |  |
Dividends, Preferred Stock |  |  |  | $ 6,900,000 | $ 6,900,000 | $ 6,900,000 |  |
Issuance of Common Shares of Beneficial Interest, Shares |  | 21,850,000 | 12,650,000 |  |  |  |  |
Net proceeds from issuance of common shares\units |  |  |  | $ 0 | $ 335,016,000 | 181,527,000 |  |
Shares Authorized For Equity Offering Program |  |  |  |  |  |  |  | 16,000,000
Additional Shares Granted under Option to Purchase in Public Offering |  |  | 1,650,000 |  |  |  |  |
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 price per share |  |  |  | $ 0.01 | $ 0.01 |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Distributions payable |  |  |  | $ 28,249,000 | $ 28,871,000 |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 6.90% | 6.90% |  |  |
Dividends, Preferred Stock |  |  |  | $ 6,900,000 | $ 6,900,000 | 6,900,000 |  |
Net proceeds from issuance of common shares\units |  |  |  | $ 0 | $ 335,016,000 | $ 181,527,000 |  |
Series E Preferred Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 6.90% |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  | $ 25.00 |  |  |  |
Offering Program [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Remaining Shares Available For Sales |  |  |  | 16,000,000 |  |  |  |
Offering Program [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Fees and Commissions Percentage |  |  |  | 2.00% |  |  |  |
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 |  |  |  | $ 26,500,000 |  |  |  |
Dividend Paid [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Distributions payable |  |  |  | $ 26,500,000 |  |  |  |
Dividend Paid [Member] | Series E Preferred Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividends, Preferred Stock | $ 1,700,000 |  |  |  |  |  |  |
Redeemable Common Limited Partnership Units |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |  | 1,535,102 | 1,535,102 | 1,763,739 |  |

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