PARTNERS' EQUITY OF THE PARENT COMPANY - Schedule of 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				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Numerator
Net income (loss)	$ (88,936)	$ (27,056)	$ 30,267	$ (16,414)	$ (115,992)	$ 13,853
Basic
Nonforfeitable dividends allocated to unvested restricted shareholders	(322)		(277)		(751)	(613)
Diluted
Nonforfeitable dividends allocated to unvested restricted unitholders, diluted	$ (322)		$ (277)		$ (751)	$ (613)
Denominator
Weighted average units outstanding, basic (in shares)	173,532,583		172,563,136		173,225,737	172,385,087
Contingent securities/Share based compensation (in shares)	0		2,132,515		0	1,957,064
Weighted average shares outstanding, diluted (in shares)	173,532,583		174,695,651		173,225,737	174,342,151
Earnings (loss) per Common Partnership Unit:
Net income (loss) attributable to common shareholders, basic (in dollars per share)	$ (0.51)		$ 0.17		$ (0.67)	$ 0.08
Net income (loss) attributable to common shareholders, diluted (in dollars per share)	$ (0.51)		$ 0.17		$ (0.67)	$ 0.08
Brandywine Operating Partnership, L.P.
Numerator
Net income (loss)	$ (88,936)	$ (27,056)	$ 30,267	$ (16,414)	$ (115,992)	$ 13,853
Basic
Net income attributable to noncontrolling interests	0		(3)		0	(6)
Nonforfeitable dividends allocated to unvested restricted shareholders	(322)		(277)		(751)	(613)
Net income (loss) attributable to common unitholders	(89,258)		29,987		(116,743)	13,234
Diluted
Nonforfeitable dividends allocated to unvested restricted unitholders, diluted	(322)		(277)		(751)	(613)
Net income (loss) attributable to common unitholders	$ (89,258)		$ 29,987		$ (116,743)	$ 13,234
Denominator
Weighted average units outstanding, basic (in shares)	174,048,178		173,078,731		173,741,332	172,900,681
Contingent securities/Share based compensation (in shares)	0		2,132,515		0	1,957,064
Weighted average shares outstanding, diluted (in shares)	174,048,178		175,211,246		173,741,332	174,857,745
Earnings (loss) per Common Partnership Unit:
Net income (loss) attributable to common shareholders, basic (in dollars per share)	$ (0.51)		$ 0.17		$ (0.67)	$ 0.08
Net income (loss) attributable to common shareholders, diluted (in dollars per share)	$ (0.51)		$ 0.17		$ (0.67)	$ 0.08