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Partners Equity of the Operating Partnership - Number of Units and Net Income Used to Calculate Basic and Diluted Earnings Per Common Partnership Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Numerator |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from continuing operations, Basic |  |  |  |  |  |  |  |  | $ 40,501 | $ (30,740) | $ 6,024
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic |  |  |  |  |  |  |  |  | (341) | (329) | (349)
Distribution to preferred shareholders |  |  |  |  |  |  |  |  | (6,900) | (6,900) | (6,900)
Income (loss) from discontinued operations, Basic |  |  |  |  |  |  |  |  | 0 | 0 | 918
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted |  |  |  |  |  |  |  |  | $ (341) | $ (329) | $ (349)
Denominator |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares outstanding (in shares) |  |  |  |  |  |  |  |  | 175,018,163 | 178,162,160 | 166,202,649
Contingent securities/Share based compensation (in shares) |  |  |  |  |  |  |  |  | 992,651 | 0 | 0
Diluted weighted average shares outstanding (in shares) |  |  |  |  |  |  |  |  | 176,010,814 | 178,162,160 | 166,202,649
Earnings (loss) per Common Share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to common shareholders, Basic (USD per share) |  |  |  |  |  |  |  |  | $ 0.19 | $ (0.21) | $ (0.01)
Discontinued operations attributable to common shareholders, Basic (USD per share) |  |  |  |  |  |  |  |  | 0 | 0 | 0.01
Net income (loss) attributable to common shareholders, Basic (USD per share) | $ (0.08) | $ 0.03 | $ (0.02) | $ 0.25 | $ (0.37) | $ 0.10 | $ 0.01 | $ 0.04 | 0.19 | (0.21) | 0
Income (loss) from continuing operations attributable to common shareholders, Diluted (USD per share) |  |  |  |  |  |  |  |  | 0.19 | (0.21) | (0.01)
Discontinued operations attributable to common shareholders, Diluted (USD per share) |  |  |  |  |  |  |  |  | 0 | 0 | 0.01
Net income (loss) attributable to common shareholders, Diluted (USD per share) | (0.08) | 0.03 | (0.02) | 0.25 | (0.37) | 0.10 | 0.01 | 0.04 | $ 0.19 | $ (0.21) | $ 0
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from continuing operations, Basic |  |  |  |  |  |  |  |  | $ 40,501 | $ (30,740) | $ 6,024
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic |  |  |  |  |  |  |  |  | (341) | (329) | (349)
Distribution to preferred shareholders |  |  |  |  |  |  |  |  | (6,900) | (6,900) | (6,900)
Net (income) loss attributable to non-controlling interests |  |  |  |  |  |  |  |  | (15) | 3 | 44
Income (loss) from continuing operations available to common unitholders, Basic |  |  |  |  |  |  |  |  | 33,245 | (37,966) | (1,181)
Income (loss) from discontinued operations, Basic |  |  |  |  |  |  |  |  | 0 | 0 | 918
Net income (loss) attributable to common unitholders, Basic |  |  |  |  |  |  |  |  | 33,245 | (37,966) | (263)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted |  |  |  |  |  |  |  |  | (341) | (329) | (349)
Income (loss) from continuing operations available to common unitholders, Diluted |  |  |  |  |  |  |  |  | 33,245 | (37,966) | (1,181)
Income (loss) from discontinued operations, diluted |  |  |  |  |  |  |  |  | 0 | 0 | 918
Net income attributable to common unitholders, Diluted |  |  |  |  |  |  |  |  | $ 33,245 | $ (37,966) | $ (263)
Denominator |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares outstanding (in shares) |  |  |  |  |  |  |  |  | 176,523,800 | 179,697,262 | 167,942,246
Contingent securities/Share based compensation (in shares) |  |  |  |  |  |  |  |  | 992,651 | 0 | 0
Diluted weighted average shares outstanding (in shares) |  |  |  |  |  |  |  |  | 177,516,451 | 179,697,262 | 167,942,246
Earnings (loss) per Common Share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to common shareholders, Basic (USD per share) |  |  |  |  |  |  |  |  | $ 0.19 | $ (0.21) | $ (0.01)
Discontinued operations attributable to common shareholders, Basic (USD per share) |  |  |  |  |  |  |  |  | 0 | 0 | 0.01
Net income (loss) attributable to common shareholders, Basic (USD per share) | (0.08) | 0.03 | (0.02) | 0.25 | (0.36) | 0.10 | 0.04 | 0.04 | 0.19 | (0.21) | 0
Income (loss) from continuing operations attributable to common shareholders, Diluted (USD per share) |  |  |  |  |  |  |  |  | 0.19 | (0.21) | (0.01)
Discontinued operations attributable to common shareholders, Diluted (USD per share) |  |  |  |  |  |  |  |  | 0 | 0 | 0.01
Net income (loss) attributable to common shareholders, Diluted (USD per share) | $ (0.08) | $ 0.03 | $ (0.02) | $ 0.25 | $ (0.36) | $ 0.10 | $ 0.04 | $ 0.04 | $ 0.19 | $ (0.21) | $ 0

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