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Partners Equity of the Operating Partnership (Textual) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Feb. 27, 2020 | Mar. 31, 2020 | Mar. 31, 2019
Earnings Per Common Partnership Unit [Line Items] |  |  |
Dividends, common stock | $ 32,700 |  |
Shares repurchased and retired (in shares) |  | 5,644,200 | 1,337,169
Share price (in dollars per share) |  | $ 9.54 | $ 12.92
Value of stock repurchased and retired |  | $ 53,858 | $ 17,281
Dividend declared |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |
Dividends payable (in dollars per share) | $ 0.19 |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |
Dividends, common stock | $ 32,700 |  |
Repurchase program, number 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) | $ 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=27012166&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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