Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue
Rents	$ 412,333	$ 421,505	$ 486,731
Tenant reimbursements	72,620	70,629	85,722
Termination fees	2,370	2,339	4,797
Third party management fees, labor reimbursement and leasing	28,345	26,674	18,764
Other	4,825	4,316	6,617
Total revenue	520,493	525,463	602,631
Operating expenses:
Property operating expenses	150,835	152,926	181,170
Real estate taxes	45,204	46,252	50,623
Third party management expenses	9,960	10,270	6,294
Depreciation and amortization	179,357	189,676	219,029
General and administrative expenses	28,538	26,596	29,406
Provision for impairment	3,057	40,517	82,208
Total operating expenses	416,951	466,237	568,730
Operating income	103,542	59,226	33,901
Other income (expense):
Interest income	1,113	1,236	1,224
Tax credit transaction income	0	0	19,955
Interest expense	(81,886)	(84,708)	(110,717)
Interest expense - amortization of deferred financing costs	(2,435)	(2,696)	(4,557)
Interest expense - financing obligation	0	(679)	(1,237)
Equity in loss of Real Estate Ventures	(8,306)	(11,503)	(811)
Net gain on disposition of real estate	31,657	116,983	20,496
Net gain on sale of undepreciated real estate	953	9,232	3,019
Net gain from remeasurement of investments in real estate ventures	0	0	758
Net gain on Real Estate Venture transactions	80,526	20,000	7,229
Loss on early extinguishment of debt	(3,933)	(66,590)	0
Net income (loss) before income taxes	121,231	40,501	(30,740)
Income tax benefit	628	0	0
Net income (loss)	121,859	40,501	(30,740)
Net (income) loss attributable to noncontrolling interests	(1,009)	(310)	339
Net income (loss) attributable to Brandywine Realty Trust	120,850	40,191	(30,401)
Distribution to preferred shareholders	(2,032)	(6,900)	(6,900)
Preferred share redemption charge	(3,181)	0	0
Nonforfeitable dividends allocated to unvested restricted shareholders	(327)	(341)	(329)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	$ 115,310	$ 32,950	$ (37,630)
Basic income (loss) per Common Share:	$ 0.66	$ 0.19	$ (0.21)
Diluted income (loss) per Common Share:	$ 0.65	$ 0.19	$ (0.21)
Basic weighted average shares outstanding	175,484,350	175,018,163	178,162,160
Diluted weighted average shares outstanding	176,808,166	176,010,814	178,162,160
Distributions declared per Common Share	$ 0.66	$ 0.63	$ 0.60
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Rents	$ 412,333	$ 421,505	$ 486,731
Tenant reimbursements	72,620	70,629	85,722
Termination fees	2,370	2,339	4,797
Third party management fees, labor reimbursement and leasing	28,345	26,674	18,764
Other	4,825	4,316	6,617
Total revenue	520,493	525,463	602,631
Operating expenses:
Property operating expenses	150,835	152,926	181,170
Real estate taxes	45,204	46,252	50,623
Third party management expenses	9,960	10,270	6,294
Depreciation and amortization	179,357	189,676	219,029
General and administrative expenses	28,538	26,596	29,406
Provision for impairment	3,057	40,517	82,208
Total operating expenses	416,951	466,237	568,730
Operating income	103,542	59,226	33,901
Other income (expense):
Interest income	1,113	1,236	1,224
Tax credit transaction income	0	0	19,955
Interest expense	(81,886)	(84,708)	(110,717)
Interest expense - amortization of deferred financing costs	(2,435)	(2,696)	(4,557)
Interest expense - financing obligation	0	(679)	(1,237)
Equity in loss of Real Estate Ventures	(8,306)	(11,503)	(811)
Net gain on disposition of real estate	31,657	116,983	20,496
Net gain on sale of undepreciated real estate	953	9,232	3,019
Net gain from remeasurement of investments in real estate ventures	0	0	758
Net gain on Real Estate Venture transactions	80,526	20,000	7,229
Loss on early extinguishment of debt	(3,933)	(66,590)	0
Net income (loss) before income taxes	121,231	40,501	(30,740)
Income tax benefit	628	0	0
Net income (loss)	121,859	40,501	(30,740)
Net (income) loss attributable to noncontrolling interests - consolidated real estate ventures	(29)	(15)	3
Net income (loss) attributable to Brandywine Realty Trust	121,830	40,486	(30,737)
Distribution to preferred shareholders	(2,032)	(6,900)	(6,900)
Preferred share redemption charge	(3,181)	0	0
Nonforfeitable dividends allocated to unvested restricted shareholders	(327)	(341)	(329)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	$ 116,290	$ 33,245	$ (37,966)
Basic income (loss) per Common Share:	$ 0.66	$ 0.19	$ (0.21)
Diluted income (loss) per Common Share:	$ 0.65	$ 0.19	$ (0.21)
Basic weighted average shares outstanding	176,964,149	176,523,800	179,697,262
Diluted weighted average shares outstanding	178,287,965	177,516,451	179,697,262
Distributions declared per Common Share	$ 0.66	$ 0.63	$ 0.60