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Basis of Presentation - Statement of Partners' Equity (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | --- | --- | ---
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Partners' equity |  |  |  | $ 1,798,508 |  |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Partners' equity | $ 1,687,709 | $ 1,715,445 | $ 1,745,042 | 1,798,508 | $ 1,733,055 | $ 1,805,756 | $ 1,824,205 | $ 1,799,955
General Partner Capital |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Partners' equity |  |  |  | 1,791,591 |  |  |  |
General Partner Capital | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Partners' equity | $ 1,689,334 | $ 1,715,685 | 1,740,552 | 1,791,591 | 1,720,870 | 1,794,623 | 1,814,960 | 1,795,684
As Previously Reported |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Partners' equity |  |  |  | 1,820,053 |  |  |  |
As Previously Reported | General Partner Capital |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Partners' equity |  |  |  | 1,813,136 |  |  |  |
As Previously Reported | General Partner Capital | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Partners' equity |  |  | 1,761,580 |  | 1,741,379 | 1,814,870 | 1,834,947 | 1,815,411
Adjustments |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Partners' equity |  |  |  | (21,545) |  |  |  |
Adjustments | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Partners' equity |  |  |  | $ (21,545) |  |  |  |
Adjustments | General Partner Capital | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Partners' equity |  |  | $ (21,028) |  | $ (20,509) | $ (20,247) | $ (19,987) | $ (19,727)

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