CONSOLIDATED STATEMENTS OF PARTNERS’ EQUITY - USD ($) $ in Thousands	Total	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest - Consolidated Real Estate Ventures	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, 2019							176,480,095
Partners' Equity, beginning balance at Dec. 31, 2019				$ 1,672,915	$ (2,715)	$ 1,091	$ 1,674,539
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 307,326		$ 1,799	307,326		20	$ 307,306
Other comprehensive income (loss)	(5,220)	$ (5,191)	(29)	(5,220)	(5,220)
Deferred compensation obligation (in shares)							32,256
Deferred compensation obligation	(206)			(206)			$ (206)
Repurchase and retirement of LP units (in shares)							(6,248,483)
Repurchase and retirement of LP units				(59,999)			$ (59,999)
Distributions from consolidated real estate venture	(22)		(22)	(22)		(22)
Share-based compensation activity (in shares)							309,096
Share-based compensation activity	6,236			6,236			$ 6,236
Sale of partnership interest to consolidated real estate venture	(1,017)		(1,017)	(1,017)		(1,017)
Adjustment of redeemable partnership units to liquidation value at period end				3,074			3,074
Distributions declared to general partnership unitholders				(130,005)			$ (130,005)
Ending balance (in shares) at Dec. 31, 2020							170,572,964
Partners' Equity, ending balance at Dec. 31, 2020				1,793,082	(7,935)	72	$ 1,800,945
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,366		77	12,366		(3)	$ 12,369
Other comprehensive income (loss)	5,569	5,541	28	5,569	5,569
Deferred compensation obligation (in shares)							(18,058)
Deferred compensation obligation	(198)			(198)			$ (198)
Issuance of LP Units (in shares)							226,695
Issuance of LP Units				3,052			$ 3,052
Repurchase and retirement of LP units				(2,334)			$ (2,334)
Issuance of partnership interest in consolidated real estate venture	2,765		2,765	2,765		2,765
Share-based compensation activity (in shares)							344,656
Share-based compensation activity	6,354			6,354			$ 6,354
Adjustment of redeemable partnership units to liquidation value at period end				(232)			(232)
Distributions declared to general partnership unitholders				(130,345)			$ (130,345)
Ending balance (in shares) at Dec. 31, 2021							171,126,257
Partners' Equity, ending balance at Dec. 31, 2021				1,690,079	(2,366)	2,834	$ 1,689,611
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	53,992		168	53,992		(2)	$ 53,994
Other comprehensive income (loss)	5,935	$ 5,917	$ 18	5,935	5,935
Deferred compensation obligation (in shares)							(25,979)
Deferred compensation obligation	(312)			(312)			$ (312)
Repurchase and retirement of LP units				(4,006)			$ (4,006)
Share-based compensation activity (in shares)							469,529
Share-based compensation activity	$ 7,718			7,718			$ 7,718
Adjustment of redeemable partnership units to liquidation value at period end				7,555			7,555
Distributions declared to general partnership unitholders				(130,822)			$ (130,822)
Ending balance (in shares) at Dec. 31, 2022							171,569,807
Partners' Equity, ending balance at Dec. 31, 2022				$ 1,630,139	$ 3,569	$ 2,832	$ 1,623,738