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Partners' Equity Of The Parent Company - Textual (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 14, 2021 USD ($) $ / shares | May 18, 2021 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2021 shares | Sep. 30, 2020 USD ($) $ / shares shares
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |
Dividends, common stock | $ | $ 32,800 |  |  |  |  |
Shares repurchased and retired (in units) | shares |  |  |  |  | 0 | 6,248,483
Share price (in dollars per unit) | $ / shares |  |  |  |  |  | $ 9.60
Value of stock repurchased and retired | $ |  |  | $ 6,141 | $ 53,858 |  | $ 60,000
Shelf Registration |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |
Number of shares issued (in units) | shares |  |  |  |  | 226,695 |
One and Two Commerce Square |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |
Percent of noncontrolling interest acquired |  |  |  |  | 1.00% |
Dividend declared |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |
Dividends payable (in dollars per unit) | $ / shares | $ 0.19 |  |  |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |  |
Dividends, common stock | $ |  | $ 32,800 |  |  |  |
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 unit) | $ / shares |  | $ 0.19 |  |  |  |

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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