Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue
Total revenue	$ 133,786	$ 127,791	$ 270,144	$ 258,711
Operating expenses
Property operating expenses	37,887	37,215	77,219	74,100
Real estate taxes	12,417	11,078	24,839	22,827
Third party management expenses	2,243	2,325	6,993	4,772
Depreciation and amortization	43,717	44,263	87,008	90,155
General and administrative expenses	7,523	6,659	16,246	15,984
Provision for impairment	0	327	0	3,057
Total operating expenses	103,787	101,867	212,305	210,895
Operating income	29,999	25,924	57,839	47,816
Other income (expense)
Interest income	641	163	1,344	556
Interest expense	(19,301)	(20,304)	(38,834)	(41,741)
Interest expense - amortization of deferred financing costs	(627)	(596)	(1,254)	(1,230)
Equity in income (loss) of Real Estate Ventures	(358)	1,084	(1,183)	336
Net gain (loss) on disposition of real estate	(35)	1,088	(35)	8,411
Net gain on sale of undepreciated real estate	2,837	0	2,859	0
Net gain on Real Estate Venture transactions	0	0	37,263	14,582
Net income before income taxes	13,156	7,359	57,999	28,730
Income tax (provision) benefit	(20)	339	(158)	239
Net income	13,136	7,698	57,841	28,969
Net income attributable to noncontrolling interests	(130)	(45)	(506)	(214)
Net income attributable to Brandywine Realty Trust	13,006	7,653	57,335	28,755
Distribution to preferred shareholders	0	(307)	0	(2,032)
Preferred share redemption charge	0	(3,181)	0	(3,181)
Nonforfeitable dividends allocated to unvested restricted shareholders	(86)	(73)	(200)	(172)
Net income attributable to Common Shareholders of Brandywine Realty Trust	$ 12,920	$ 4,092	$ 57,135	$ 23,370
Basic income per Common Share	$ 0.07	$ 0.02	$ 0.32	$ 0.13
Diluted income per Common Share	$ 0.07	$ 0.02	$ 0.32	$ 0.13
Basic weighted average shares outstanding	178,547,555	175,333,300	178,471,960	175,255,564
Diluted weighted average shares outstanding	179,692,336	176,756,598	179,740,690	176,480,380
Distributions declared per Common Share	$ 0.18	$ 0.16	$ 0.36	$ 0.32
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	$ 133,786	$ 127,791	$ 270,144	$ 258,711
Operating expenses
Property operating expenses	37,887	37,215	77,219	74,100
Real estate taxes	12,417	11,078	24,839	22,827
Third party management expenses	2,243	2,325	6,993	4,772
Depreciation and amortization	43,717	44,263	87,008	90,155
General and administrative expenses	7,523	6,659	16,246	15,984
Provision for impairment	0	327	0	3,057
Total operating expenses	103,787	101,867	212,305	210,895
Operating income	29,999	25,924	57,839	47,816
Other income (expense)
Interest income	641	163	1,344	556
Interest expense	(19,301)	(20,304)	(38,834)	(41,741)
Interest expense - amortization of deferred financing costs	(627)	(596)	(1,254)	(1,230)
Equity in income (loss) of Real Estate Ventures	(358)	1,084	(1,183)	336
Net gain (loss) on disposition of real estate	(35)	1,088	(35)	8,411
Net gain on sale of undepreciated real estate	2,837	0	2,859	0
Net gain on Real Estate Venture transactions	0	0	37,263	14,582
Net income before income taxes	13,156	7,359	57,999	28,730
Income tax (provision) benefit	(20)	339	(158)	239
Net income	13,136	7,698	57,841	28,969
Net income attributable to non-controlling interests - consolidated real estate ventures	(21)	(8)	(26)	(13)
Net income attributable to Brandywine Realty Trust	13,115	7,690	57,815	28,956
Distribution to preferred shareholders	0	(307)	0	(2,032)
Preferred share redemption charge	0	(3,181)	0	(3,181)
Nonforfeitable dividends allocated to unvested restricted shareholders	(86)	(73)	(200)	(172)
Net income attributable to Common Shareholders of Brandywine Realty Trust	$ 13,029	$ 4,129	$ 57,615	$ 23,571
Basic income per Common Share	$ 0.07	$ 0.02	$ 0.32	$ 0.13
Diluted income per Common Share	$ 0.07	$ 0.02	$ 0.32	$ 0.13
Basic weighted average shares outstanding	180,027,354	176,813,099	179,951,759	176,735,363
Diluted weighted average shares outstanding	181,172,135	178,236,397	181,220,489	177,960,179
Distributions declared per Common Share	$ 0.18	$ 0.16	$ 0.36	$ 0.32
Rents [Member]
Revenue
Lease revenue	$ 107,657	$ 101,557	$ 214,017	$ 204,889
Rents [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Lease revenue	107,657	101,557	214,017	204,889
Tenant Reimbursements [Member]
Revenue
Service and other revenue	18,688	18,038	38,537	36,573
Tenant Reimbursements [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Service and other revenue	18,688	18,038	38,537	36,573
Termination Fees [Member]
Revenue
Lease revenue	582	140	1,132	1,813
Termination Fees [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Lease revenue	582	140	1,132	1,813
Third Party Management Fees, Labor Reimbursement and Leasing [Member]
Revenue
Service and other revenue	4,913	7,080	12,587	13,565
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Service and other revenue	4,913	7,080	12,587	13,565
Other [Member]
Revenue
Service and other revenue	1,946	976	3,871	1,871
Other [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Service and other revenue	$ 1,946	$ 976	$ 3,871	$ 1,871