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BENEFICIARIES' EQUITY OF THE PARENT COMPANY - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 08, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 03, 2019 | Jan. 10, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends, common stock | $ 32,700 |  |  |  |  |  |
Preferred shares authorized (in shares) |  | 20,000,000 | 20,000,000 |  |  |  |
Preferred shares outstanding (in shares) |  | 0 | 0 |  |  |  |
Repurchased and retired (in shares) |  | 6,248,483 | 1,337,169 | 1,729,278 | 0 |  |
Share price (in usd per share) |  | $ 9.60 | $ 12.92 | $ 12.64 |  |  |
Repurchased and retired, value |  | $ 59,999 | $ 17,281 | $ 21,858 |  |  |
Common stock, par or stated value per share (usd per share) |  | $ 0.01 | $ 0.01 |  |  |  |
Common stock, shares authorized (in shares) |  | 400,000,000 | 400,000,000 |  |  |  |
Cash proceeds, net of issuance costs |  | $ 0 | $ 0 | $ 416 |  |  |
Common shares remain available for issuance (in shares) |  | 0 |  |  |  |  |
Offering Program |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  |  | 16,000,000
Common shares issued under offering program (in shares) |  | 0 | 0 | 23,311 |  |  |
Weighted average price per share (usd per share) |  |  |  | $ 18.04 |  |  |
Cash proceeds, net of issuance costs |  |  |  | $ 400 |  |  |
Maximum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Authorized amount |  |  |  |  |  | $ 150,000 |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Repurchase program, number of common units retired for each common share repurchased (in units) |  | 1 |  |  |  |  |
Cash proceeds, net of issuance costs |  | $ 0 | $ 0 | $ 416 |  |  |
Dividend Declared |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends payable, amount per share (in usd per share) | $ 0.19 |  |  |  |  |  |
Redeemable Common Limited Partnership Units |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in units) |  | 981,634 | 981,634 | 982,871 |  |  |

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