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Beneficiaries Equity of the Parent Company - Number of Shares and Net Income Used to Calculate Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 122,710 | [1] | $ (43,262) | [2] | $ 13,136 | $ 44,705 | $ 73,844 | $ 19,046 | $ 7,698 | $ 21,271 | $ 137,289 | $ 121,859 | $ 40,501
Net income attributable to noncontrolling interests, Basic |  |  |  |  |  |  |  |  |  |  | (965) | (1,009) | (310)
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic |  |  |  |  |  |  |  |  |  |  | (369) | (327) | (341)
Distribution to preferred shareholders |  |  |  |  |  |  |  |  |  |  | 0 | (2,032) | (6,900)
Preferred share redemption charge |  |  |  |  |  |  |  |  |  |  | 0 | (3,181) | 0
Net income attributable to Common Shareholders of Brandywine Realty Trust |  |  |  |  |  |  |  |  |  |  | 135,955 | 115,310 | 32,950
Net income attributable to noncontrolling interests, Diluted |  |  |  |  |  |  |  |  |  |  | (965) | (1,009) | (310)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted |  |  |  |  |  |  |  |  |  |  | (369) | (327) | (341)
Net income attributable to common shareholders, Diluted |  |  |  |  |  |  |  |  |  |  | $ 135,955 | $ 115,310 | $ 32,950
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  | 178,519,748 | 175,484,350 | 175,018,163
Contingent securities/Share based compensation (in shares) |  |  |  |  |  |  |  |  |  |  | 1,121,744 | 1,323,816 | 992,651
Diluted weighted average shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  | 179,641,492 | 176,808,166 | 176,010,814
Earnings per Common Share: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareholders, Basic (USD per share) | $ 0.68 |  | $ (0.24) |  | $ 0.07 | $ 0.25 | $ 0.42 | $ 0.11 | $ 0.02 | $ 0.11 | $ 0.76 | $ 0.66 | $ 0.19
Net income attributable to common shareholders, Diluted (USD per share) | $ 0.68 |  | $ (0.24) |  | $ 0.07 | $ 0.25 | $ 0.41 | $ 0.11 | $ 0.02 | $ 0.11 | $ 0.76 | $ 0.65 | $ 0.19
[1] | The increase in net income for the fourth quarter primarily relates to gains of $103.8 million and $28.3 million, recorded in the “Net gain on real estate venture transactions” and “Gain on promoted interest in unconsolidated real estate venture” captions within the Company’s consolidated statements of operations, respectively, from the Austin Portfolio transaction. For further details, see Note 3, "Real Estate Investments."
[2] | The decrease in third quarter net income primarily relates to a $56.9 million impairment charge which related to eight office properties in the Company’s Metropolitan Washington, D.C. segment. See Note 3, “Real Estate Investments,” for further information.

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