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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revised Statements of Equity (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] |  |  |  |
Total beneficiaries' equity | $ 1,688,303 | $ 1,811,028 | $ 1,826,870 | $ 1,864,388
Total partners' equity |  | 1,798,508 |  |
Additional Paid-in Capital |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total beneficiaries' equity | 3,192,158 | 3,200,312 | 3,218,077 | 3,258,386
Cumulative Earnings |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total beneficiaries' equity | 804,556 | 775,625 | 641,093 | 520,914
Noncontrolling Interests |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total beneficiaries' equity | 10,426 | 12,201 | 17,258 | 16,933
As previously reported |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total beneficiaries' equity |  | 1,832,573 |  |
Total partners' equity |  | 1,820,053 |  |
As previously reported | Additional Paid-in Capital |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total beneficiaries' equity |  | 3,200,850 | 3,218,564 | 3,258,870
As previously reported | Cumulative Earnings |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total beneficiaries' equity |  | 796,513 | 660,174 | 539,319
As previously reported | Noncontrolling Interests |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total beneficiaries' equity |  | 12,320 | 17,420 | 17,093
Adjustments |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total beneficiaries' equity |  | (21,545) |  |
Total partners' equity |  | (21,545) |  |
Adjustments | Additional Paid-in Capital |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total beneficiaries' equity |  | (538) | (487) | (484)
Adjustments | Cumulative Earnings |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total beneficiaries' equity |  | (20,888) | (19,081) | (18,405)
Adjustments | Noncontrolling Interests |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total beneficiaries' equity |  | (119) | (162) | (160)
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total partners' equity | 1,672,915 | 1,798,508 | 1,799,955 | 1,840,593
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Noncontrolling Interests |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total partners' equity | 1,091 | 2,192 | 2,215 | 2,150
BRANDYWINE OPERATING PARTNERSHIP, L.P. | General Partner Capital |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total partners' equity | $ 1,674,539 | 1,791,591 | 1,795,684 | 1,743,715
BRANDYWINE OPERATING PARTNERSHIP, L.P. | General Partner Capital | As previously reported |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total partners' equity |  | 1,813,136 | 1,815,411 | 1,762,764
BRANDYWINE OPERATING PARTNERSHIP, L.P. | General Partner Capital | Adjustments |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Total partners' equity |  | $ (21,545) | $ (19,727) | $ (19,049)

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