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PARTNERS' EQUITY OF THE PARENT COMPANY - Narrative (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 06, 2022 USD ($) $ / shares | Dec. 31, 2022 class_of_units $ / shares shares | Dec. 31, 2021 $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Number of classes of partnership units | class_of_units |  | 2 |  |  |
Amount of dividend declared | $ | $ 32,800 |  |  |  |
Repurchased and retired (in shares) |  | 0 | 0 | 6,248,483 | 1,337,169
Share price (in usd per share) | $ / shares |  |  |  | $ 9.60 | $ 12.92
Repurchased and retired, value | $ |  |  |  | $ 59,999 | $ 17,300
Common stock, par or stated value per share (in usd per share) | $ / shares |  | $ 0.01 | $ 0.01 |  |
Commerce Square |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Percent of noncontrolling interest acquired |  |  | 1.00% |  |
Shelf Registration |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Number of shares issued (in shares) |  |  | 226,695 |  |
Dividend Declared |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Dividends payable (in dollars per share) | $ / shares | $ 0.19 |  |  |  |
Class A Units |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Redeemable limited partnership unit price (in dollars per share) | $ / shares |  | $ 6.15 | $ 13.42 | $ 11.91 |
Limited partners' capital account, units outstanding (in units) |  | 516,467 | 823,983 | 981,634 |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |
Earnings Per Common Partnership Unit [Line Items] |  |  |  |  |
Preferred units, outstanding (in units) |  | 0 | 0 |  |
Repurchase program, number of mirror unit of operating partnership retired for each common share repurchased |  | 1 |  |  |

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