Consolidated Statement of Partners' Equity (USD $) In Thousands, except Share data	Total	BRANDYWINE OPERATING PARTNERSHIP, L.P.	Series E Preferred Stock [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Series E-linked Preferred Stock [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	General Partner [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Noncontrolling Interest [Member]	Noncontrolling Interest [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Total partners equity [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.
Beginning Balance at Dec. 31, 2011	$ 1,889,696		$ 55,538	$ 0	$ 1,754,302	$ (6,079)	$ (6,426)	$ 33,105		$ 1,851,326
Beginning Balance, shares at Dec. 31, 2011			2,300,000	0	142,690,755
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	6,529	6,529			6,529			(66)		6,529
Comprehensive income (loss)	(10,026)	(10,026)				(9,839)	(10,026)	(187)		(10,026)
Deferred Compensation Obligation Shares					(5,564)
Deferred Compensation Obligation										0
Stock Issued During Period, Shares, New Issues				4,000,000
Stock Issued During Period, Value, New Issues	96,850			96,850						96,850
Preferred share issuance costs	(613)				(613)					(613)
Redemption of preferred shares, Value	(103,448)		(55,538)							(103,450)
Redemption of preferred shares, Shares			(2,300,000)
Share-based compensation activity	6,432				6,432					6,432
Stock Issued During Period, Shares, Other					35,703
Bonus share issuance	387				387					387
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures					797,375
Stock Issued During Period, Value, Conversion of Units	(167)				(49)			(268)		(49)
Stock Issued During Period, Shares, Conversion of Units					20,464
Conversion of LP units to cash	(9,741)				(9,741)			(5,556)		(9,741)
Adjustment of Redeemable Partnership Units to Liquidation Value at Period End					9,968					9,968
Dividends, Preferred Stock, Cash	(10,405)				(10,405)					(10,405)
Preferred share/unit redemption charge	(4,052)	(4,052)			(4,052)					(4,052)
Partners' Capital Account, Distributions					(86,417)					(86,417)
Ending Balance at Dec. 31, 2012	1,773,516		0	96,850	1,666,341	(15,918)	(16,452)	21,238	0	1,746,739
Ending Balance, shares at Dec. 31, 2012			0	4,000,000	143,538,733
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	43,189	43,189			43,189			412		43,189
Comprehensive income (loss)	13,075	13,075				12,923	13,075	152		13,075
Deferred Compensation Obligation Shares					(5,012)
Deferred Compensation Obligation										0
Stock Issued During Period, Value, New Issues	182,034
Issuance of LP Units					181,289					181,289
Issuance of LP Units Shares					12,650,000
Preferred Stock, Shares Issued	4,000,000	4,000,000
Preferred share issuance costs	(744)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	946							946	946	946
Share-based compensation activity	9,438				9,437					9,437
Stock Issued During Period, Shares, Other					27,918
Bonus share issuance	361				361					361
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures					438,356
Stock Issued During Period, Value, Conversion of Units	0				1,240			(1,240)		1,240
Stock Issued During Period, Shares, Conversion of Units					81,998
Adjustment of Redeemable Partnership Units to Liquidation Value at Period End					(778)					(778)
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock					(1,240)					(1,240)
Dividends, Preferred Stock, Cash	(6,900)				(6,900)					(6,900)
Preferred share/unit redemption charge	0	0
Partners' Capital Account, Distributions					(92,409)					(92,409)
Ending Balance at Dec. 31, 2013	1,921,435	1,894,949	0	96,850	1,800,530	(2,995)	(3,377)	21,215	946	1,894,949
Ending Balance, shares at Dec. 31, 2013			0	4,000,000	156,731,993
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	6,942	6,942			6,942			(33)	(44)	6,898
Comprehensive income (loss)	(1,630)	(1,630)				(1,612)	(1,630)	(18)		(1,630)
Deferred Compensation Obligation Shares					80,152
Deferred Compensation Obligation					(90)					(90)
Stock Issued During Period, Shares, New Issues	21,850,000
Stock Issued During Period, Value, New Issues	335,398
Issuance of LP Units					334,903					334,903
Issuance of LP Units Shares					21,850,000
Preferred Stock, Shares Issued	4,000,000	4,000,000
Preferred share issuance costs	(495)
Share-based compensation activity	6,847				6,847					6,847
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures					403,902
Stock Issued During Period, Value, Conversion of Units	0				3,614			(3,614)		3,614
Stock Issued During Period, Shares, Conversion of Units					228,536
Share Choice Plan Issuance Shares	0				(1,423)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	184,116
Adjustment of Redeemable Partnership Units to Liquidation Value at Period End					942					942
adjustment to non controlling interest					(108)				108
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock					(3,614)					(3,614)
Dividends, Preferred Stock, Cash	(6,900)				(6,900)					(6,900)
Preferred share/unit redemption charge	0	0
Partners' Capital Account, Distributions					(101,164)					(101,164)
Ending Balance at Dec. 31, 2014	$ 2,159,326	$ 2,134,755	$ 0	$ 96,850	$ 2,041,902	$ (4,607)	$ (5,007)	$ 18,499	$ 1,010	$ 2,134,755
Ending Balance, shares at Dec. 31, 2014			0	4,000,000	179,293,160