CONSOLIDATED STATEMENTS OF OPERATIONS - BRANDYWINE OPERATING PARTNERSHIP, L.P. - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue
Total revenue	$ 514,651	$ 506,100	$ 486,819
Operating expenses
Property operating expenses	129,885	130,209	121,890
Real estate taxes	49,974	53,645	53,621
Third party management expenses	10,088	10,547	12,800
Depreciation and amortization	188,797	177,984	178,105
General and administrative expenses	34,862	35,006	30,153
Provision for impairment	131,573	4,663	0
Total operating expenses	545,179	412,054	396,569
Gain on sale of real estate
Net gain on disposition of real estate	7,736	17,677	142
Net gain on sale of undepreciated real estate	1,211	8,007	2,903
Total gain on sale of real estate	8,947	25,684	3,045
Operating income (loss)	(21,581)	119,730	93,295
Other income (expense):
Interest and investment income	1,671	1,905	8,295
Interest expense	(95,456)	(68,764)	(62,617)
Interest expense - amortization of deferred financing costs	(4,369)	(3,091)	(2,836)
Investment (loss) income	(77,915)	(22,016)	(26,697)
Net gain on real estate venture transactions	181	26,718	2,973
Gain (loss) on early extinguishment of debt	138	(435)	0
Net income (loss) before income taxes	(197,331)	54,047	12,413
Income tax provision	(72)	(55)	(47)
Net income (loss)	(197,403)	53,992	12,366
Nonforfeitable dividends allocated to unvested restricted shareholders	(567)	(456)	(421)
Net income (loss) attributable to common shareholders, Basic	$ (197,356)	$ 53,368	$ 11,868
Basic income (loss) per Common Share (in dollars per shares)	$ (1.15)	$ 0.31	$ 0.07
Diluted income (loss) per Common Share (in dollars per share)	$ (1.15)	$ 0.31	$ 0.07
Basic weighted average shares outstanding (in shares)	171,959,210	171,491,369	170,878,185
Diluted weighted average shares outstanding (in shares)	171,959,210	172,325,646	172,273,240
Rents
Revenue
Total revenue	$ 479,849	$ 470,851	$ 451,519
Third party management fees, labor reimbursement and leasing
Revenue
Total revenue	24,417	24,132	26,444
Other
Revenue
Total revenue	10,385	11,117	8,856
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	514,651	506,100	486,819
Operating expenses
Property operating expenses	129,885	130,209	121,890
Real estate taxes	49,974	53,645	53,621
Third party management expenses	10,088	10,547	12,800
Depreciation and amortization	188,797	177,984	178,105
General and administrative expenses	34,862	35,006	30,153
Provision for impairment	131,573	4,663	0
Total operating expenses	545,179	412,054	396,569
Gain on sale of real estate
Net gain on disposition of real estate	7,736	17,677	142
Net gain on sale of undepreciated real estate	1,211	8,007	2,903
Total gain on sale of real estate	8,947	25,684	3,045
Operating income (loss)	(21,581)	119,730	93,295
Other income (expense):
Interest and investment income	1,671	1,905	8,295
Interest expense	(95,456)	(68,764)	(62,617)
Interest expense - amortization of deferred financing costs	(4,369)	(3,091)	(2,836)
Investment (loss) income	(77,915)	(22,016)	(26,697)
Net gain on real estate venture transactions	181	26,718	2,973
Gain (loss) on early extinguishment of debt	138	(435)	0
Net income (loss) before income taxes	(197,331)	54,047	12,413
Income tax provision	(72)	(55)	(47)
Net income (loss)	(197,403)	53,992	12,366
Net loss attributable to noncontrolling interests - consolidated real estate ventures	22	2	3
Net income (loss) attributable to Brandywine Operating Partnership	(197,381)	53,994	12,369
Nonforfeitable dividends allocated to unvested restricted shareholders	(567)	(456)	(421)
Net income (loss) attributable to common shareholders, Basic	$ (197,948)	$ 53,538	$ 11,948
Basic income (loss) per Common Share (in dollars per shares)	$ (1.15)	$ 0.31	$ 0.07
Diluted income (loss) per Common Share (in dollars per share)	$ (1.15)	$ 0.31	$ 0.07
Basic weighted average shares outstanding (in shares)	172,475,645	172,036,481	171,770,843
Diluted weighted average shares outstanding (in shares)	172,475,645	172,870,758	173,165,898
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Rents
Revenue
Total revenue	$ 479,849	$ 470,851	$ 451,519
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Third party management fees, labor reimbursement and leasing
Revenue
Total revenue	24,417	24,132	26,444
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Other
Revenue
Total revenue	$ 10,385	$ 11,117	$ 8,856