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BENEFICIARIES' EQUITY OF THE PARENT COMPANY - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 11, 2019 | Apr. 11, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 03, 2019 | Jan. 10, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends, common stock | $ 33,800 |  |  |  |  |  |
Preferred shares authorized (in shares) |  |  | 20,000,000 |  |  |  |
Preferred shares outstanding (in shares) |  |  | 0 |  |  |  |
Preferred share redemption charge |  |  | $ 0 | $ 0 | $ 3,181 |  |
Repurchased and retired (in shares) |  |  | 1,337,169 | 1,729,278 | 0 |  |
Share price (in usd per share) |  |  | $ 12.92 | $ 12.64 |  |  |
Repurchased and retired, value |  |  | $ 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 | $ 416 | $ 51,225 |  |
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 | 23,311 | 2,858,991 |  |
Weighted average price per share (usd per share) |  |  |  | $ 18.04 | $ 18.19 |  |
Cash proceeds, net of issuance costs |  |  |  | $ 400 | $ 51,200 |  |
Common shares remain available for issuance (in shares) |  |  | 13,117,698 |  |  |  |
Maximum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Authorized amount |  |  |  |  |  | $ 150,000 |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends, common stock | $ 33,800 |  |  |  |  |  |
Preferred share redemption charge |  |  | $ 0 | 0 | 3,181 |  |
Repurchase program, number of common units retired for each common share repurchased (in units) |  |  | 1 |  |  |  |
Cash proceeds, net of issuance costs |  |  | $ 0 | $ 416 | $ 51,225 |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Series E Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Redemption outstanding shares (in shares) |  | 4,000,000 |  |  |  |  |
Redemption price per share (in usd per share) |  | $ 25.51 |  |  |  |  |
Accrued dividends paid in cash |  | $ 2,000 |  |  |  |  |
Preferred share redemption charge |  | $ 3,200 |  |  |  |  |
Dividend Declared |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends payable, amount per share (in usd per share) | $ 0.19 |  |  |  |  |  |
Dividend Declared | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |
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 | 982,871 | 1,479,799 |  |

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