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Beneficiaries Equity of the Parent Company Beneficiaries Equity of the Parent Company (Details Textuals) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 6 Months Ended |  | 6 Months Ended | 12 Months Ended | 0 Months Ended | 6 Months Ended |  | 6 Months Ended | 12 Months Ended |  | 36 Months Ended
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Apr. 10, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 Class A Units [Member] | Dec. 31, 2012 Class A Units [Member] | Jul. 15, 2013 Series E Preferred Stock [Member] | Jun. 30, 2013 Series E Preferred Stock [Member] | May 30, 2013 Dividend Declared [Member] | May 30, 2013 Dividend Paid [Member] | Jun. 30, 2013 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Jun. 30, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dec. 31, 2012 BRANDYWINE OPERATING PARTNERSHIP, L.P. | May 30, 2013 BRANDYWINE OPERATING PARTNERSHIP, L.P. | Mar. 10, 2013 BRANDYWINE OPERATING PARTNERSHIP, L.P. Offering Program [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  | 1,763,739 | 2,657,721 |  |  |  |  |  |  |  |  |
Common stock issued subsequent to balance sheet date, New issues | 12,650,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional shares granted under option to purchase in public offering | 1,650,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 181,700 | $ 181,527 | $ 0 |  |  |  |  |  |  |  | $ 181,527 | $ 0 |  |  |
Distribution Declared Per Common Partnership Unit |  |  |  |  |  |  |  |  | $ 0.15 |  |  |  |  | $ 0.15 |
Distributions payable |  | 25,587 |  | 23,652 |  |  |  |  |  | 23,800 | 25,587 |  | 23,652 | 23,800 |
Preferred Stock, Shares Issued |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  | 4,000,000 |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  | 6.90% |  |  | 6.90% |  | 6.90% |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |  |
Dividends, Preferred Stock, Cash |  | $ 3,450 | $ 5,047 |  |  |  | $ 1,700 |  |  |  |  |  |  |  |
Shares Authorized For Equity Offering Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000
Maximum percentage of Gross sale price per share compensation to sales agents |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00%
Number Of Shares Sold By Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,421,553
Average Sales Price Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.50
Additional shares Expected to be purchased under program |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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