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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revised Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Operating properties | $ 4,006,459 | $ 3,951,719 |  |
Accumulated depreciation | (973,318) | (885,407) | $ (913,297) |
Operating real estate investments, net | 3,054,797 | 3,066,312 |  |
Total assets | 4,075,969 | 4,076,976 |  |
Additional paid-in-capital | 3,192,158 | 3,200,312 |  |
Cumulative earnings | 804,556 | 775,625 |  |
Total Brandywine Realty Trust's equity | 1,677,877 | 1,798,827 |  |
Noncontrolling interests | 10,426 | 12,201 |  |
Total beneficiaries' equity | 1,688,303 | 1,811,028 | $ 1,826,870 | $ 1,864,388
Total liabilities and equity | $ 4,075,969 | 4,076,976 |  |
Total Brandywine Operating Partnership, L.P.'s equity |  | 1,796,316 |  |
Total partners' equity |  | 1,798,508 |  |
As previously reported |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Operating properties |  | 3,953,319 |  |
Accumulated depreciation |  | (865,462) |  |
Operating real estate investments, net |  | 3,087,857 |  |
Total assets |  | 4,098,521 |  |
Additional paid-in-capital |  | 3,200,850 |  |
Cumulative earnings |  | 796,513 |  |
Total Brandywine Realty Trust's equity |  | 1,820,253 |  |
Noncontrolling interests |  | 12,320 |  |
Total beneficiaries' equity |  | 1,832,573 |  |
Total liabilities and equity |  | 4,098,521 |  |
Total Brandywine Operating Partnership, L.P.'s equity |  | 1,817,861 |  |
Total partners' equity |  | 1,820,053 |  |
Adjustments |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Operating properties |  | (1,600) |  |
Accumulated depreciation |  | (19,945) |  |
Operating real estate investments, net |  | (21,545) |  |
Total assets |  | (21,545) |  |
Additional paid-in-capital |  | (538) |  |
Cumulative earnings |  | (20,888) |  |
Total Brandywine Realty Trust's equity |  | (21,426) |  |
Noncontrolling interests |  | (119) |  |
Total beneficiaries' equity |  | (21,545) |  |
Total liabilities and equity |  | (21,545) |  |
Total Brandywine Operating Partnership, L.P.'s equity |  | (21,545) |  |
Total partners' equity |  | (21,545) |  |
General Partner Capital |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
General Partnership Capital; 176,480,095 and 176,873,324 units issued and outstanding as of December 31, 2019 and December 31, 2018, respectively |  | 1,791,591 |  |
General Partner Capital | As previously reported |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
General Partnership Capital; 176,480,095 and 176,873,324 units issued and outstanding as of December 31, 2019 and December 31, 2018, respectively |  | 1,813,136 |  |
General Partner Capital | Adjustments |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
General Partnership Capital; 176,480,095 and 176,873,324 units issued and outstanding as of December 31, 2019 and December 31, 2018, respectively |  | $ (21,545) |  |

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