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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
	Mar. 31, 2019	Mar. 31, 2018
Numerator
Net income	$ 4,066	$ 44,705
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(119)	(114)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	$ (119)	$ (114)
Denominator
Basic weighted average shares outstanding (in shares)	175,857,358	178,395,525
Basic contingent securities/Share based compensation (in shares)	0	0
Contingent securities/Share based compensation (in shares)	606,860	1,392,786
Diluted weighted average shares outstanding (in shares)	176,464,218	179,788,311
Earnings per Common Partnership Unit:
Net income attributable to common shareholders, Basic (USD per share)	$ 0.02	$ 0.25
Net income attributable to common shareholders, Diluted (USD per share)	$ 0.02	$ 0.25
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Numerator
Net income	$ 4,066	$ 44,705
Net income attributable to noncontrolling interests	(34)	(5)
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(119)	(114)
Net income attributable to common unitholders, Basic	3,913	44,586
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	(119)	(114)
Net income attributable to common unitholders, Diluted	$ 3,913	$ 44,586
Denominator
Basic weighted average shares outstanding (in shares)	176,840,229	179,875,324
Basic contingent securities/Share based compensation (in shares)	0	0
Contingent securities/Share based compensation (in shares)	606,860	1,392,786
Diluted weighted average shares outstanding (in shares)	177,447,089	181,268,110
Earnings per Common Partnership Unit:
Net income attributable to common shareholders, Basic (USD per share)	$ 0.02	$ 0.25
Net income attributable to common shareholders, Diluted (USD per share)	$ 0.02	$ 0.25

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