CONSOLIDATED STATEMENTS OF PARTNERS’ EQUITY - USD ($) $ in Thousands	Total	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest - Consolidated Real Estate Ventures	General Partner Capital	BRANDYWINE OPERATING PARTNERSHIP, L.P.	BRANDYWINE OPERATING PARTNERSHIP, L.P. Accumulated Other Comprehensive Income (Loss)	BRANDYWINE OPERATING PARTNERSHIP, L.P. Noncontrolling Interest - Consolidated Real Estate Ventures	BRANDYWINE OPERATING PARTNERSHIP, L.P. General Partner Capital
Beginning balance (in shares) at Dec. 31, 2020								170,572,964
Beginning Balance at Dec. 31, 2020					$ 1,793,082	$ (7,935)	$ 72	$ 1,800,945
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	$ 6,964		$ 43		6,964		(1)	$ 6,965
Other comprehensive income (loss)	1,098	$ 1,092	6		1,098	1,098
Deferred compensation obligation (in shares)								(18,058)
Deferred compensation obligation	(198)				(198)			$ (198)
Share-based compensation activity (in shares)								108,345
Share-based compensation activity	2,502				2,502			$ 2,502
Adjustment of redeemable partnership units to liquidation value at period end					(1,294)			(1,294)
Distributions declared to general partnership unitholders					(32,573)			$ (32,573)
Ending balance (in shares) at Mar. 31, 2021								170,663,251
Ending Balance at Mar. 31, 2021					1,769,581	(6,837)	71	$ 1,776,347
Beginning balance (in shares) at Dec. 31, 2021								171,126,257
Beginning Balance at Dec. 31, 2021					1,690,079	(2,366)	2,834	$ 1,689,611
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	6,101		8		6,101		(2)	$ 6,103
Other comprehensive income (loss)	3,952	$ 3,940	$ 12		3,952	3,952
Deferred compensation obligation (in shares)								(19,406)
Deferred compensation obligation	(249)				(249)			$ (249)
Repurchase and retirement of LP units (in shares)				(307,516)
Repurchase and retirement of LP units					(4,006)			$ (4,006)
Share-based compensation activity (in shares)								277,061
Share-based compensation activity	$ 1,655				1,655			$ 1,655
Adjustment of redeemable partnership units to liquidation value at period end					3,704			3,704
Distributions declared to general partnership unitholders					(32,711)			$ (32,711)
Ending balance (in shares) at Mar. 31, 2022								171,383,912
Ending Balance at Mar. 31, 2022					$ 1,668,525	$ 1,586	$ 2,832	$ 1,664,107