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Partners' Equity Of The Parent Company - Textual (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 15, 2020 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |
Dividends, common stock | $ | $ 32,700 |  |  |  |  |
Shares repurchased and retired (in shares) | shares |  |  |  |  | 6,248,483 | 1,337,169
Share price (in dollars per share) | $ / shares |  |  |  |  | $ 9.60 | $ 12.92
Value of stock repurchased and retired | $ |  | $ 6,141 | $ 53,858 | $ 17,281 | $ 60,000 | $ 17,300
Dividend declared |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |
Dividends payable (in dollars per share) | $ / shares | $ 0.19 |  |  |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |
Dividends, common stock | $ | $ 32,700 |  |  |  |  |
Repurchase program, ratio of mirror unit of operating partnership retired for each common share repurchased |  |  |  |  | 1 |
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dividend declared |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |
Dividends payable (in dollars per share) | $ / shares | $ 0.19 |  |  |  |  |

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