Consolidated Statement of Partners' Equity (USD $) In Thousands, except Share data	Total	BRANDYWINE OPERATING PARTNERSHIP, L.P.	Series D Preferred Stock [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Series E Preferred Stock [Member]	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, 2010	$ 1,977,774		$ 47,912	$ 43	$ 55,538	$ 0	$ 1,743,549	$ (1,945)	$ (2,080)	$ 128,272	$ 0	$ 1,844,919
Beginning Balance, shares at Dec. 31, 2010			2,000,000	4,300,000	2,300,000	0	134,485,117
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(4,715)	(4,715)					(4,715)			(215)		(4,715)
Comprehensive income (loss)	(4,346)	(4,346)						(4,134)	(4,346)	(212)		(4,346)
Deferred Compensation Obligation Shares							(845)
Deferred Compensation Obligation							(16)					(16)
Issuance of LP Units							8,272					8,272
Issuance of LP Units Shares							679,285
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	(377)									(32)
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	6						6					6
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures							463
Stock Issued During Period, Value, Conversion of Units	0						86,038			(86,038)		86,038
Stock Issued During Period, Shares, Conversion of Units							7,204,104
Share Choice Plan Issuance Value	(55)						(55)					(55)
Share Choice Plan Issuance Shares							1,684
Stock Issued During Period, Value, Restricted Stock Award, Gross	(350)						(352)					(352)
Stock Issued During Period, Shares, Restricted Stock Award, Gross							201,464
Restricted Stock Amortization	2,937						2,937					2,937
Restricted Performance Units Amortization	1,679						1,679					1,679
Outperformance Plan Amortization	123						123					123
Amortization of ESOP Award	1,487						1,487					1,487
Trustee Fees Paid in Shares							32					32
Trustee fees paid in shares units							2,672
Stock Issued During Period, Value, Stock Options Exercised	350						350					350
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period							120,179
Adjustment of Redeemable Partnership Units to Liquidation Value at Period End							5,778					5,778
Dividends, Preferred Stock, Cash	(7,992)						(7,992)					(7,992)
Preferred share/unit redemption charge	0	0
Partners' Capital Account, Distributions							(82,819)					(82,819)
Ending Balance at Dec. 31, 2011	1,889,696		47,912	43	55,538	0	1,754,302	(6,079)	(6,426)	33,105	0	1,851,326
Ending Balance, shares at Dec. 31, 2011			2,000,000	4,300,000	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					0
Preferred Stock, Value, Issued	40	96,850				96,850						96,850
Preferred Stock, Shares Issued	4,000,000	4,000,000				4,000,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	(613)						(613)					(613)
Redemption of preferred shares, Value	103,448		(47,912)	43	(55,538)							(103,450)
Redemption of preferred shares, Shares			(2,000,000)	(4,300,000)	(2,300,000)
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	387						387					387
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures							35,703
Stock Issued During Period, Value, Conversion of Units	(167)						(49)			(268)		(49)
Stock Issued During Period, Shares, Conversion of Units							20,464
Partners' Capital Account, Redemptions	9,741						(9,741)			5,556		(9,741)
Stock Issued During Period, Value, Restricted Stock Award, Gross	(1,385)						(1,385)					(1,385)
Stock Issued During Period, Shares, Restricted Stock Award, Gross							293,614
Restricted Stock Amortization	3,271						3,271					3,271
Restricted Stock Award, Forfeitures	(35)						35					35
Stock Issued During Period, Value, Vesting of restricted performance units	(1,495)						(1,495)					(1,495)
Stock Issued During Period, Shares, Vesting of restricted performance units							272,131
Restricted Performance Units Amortization	3,379						3,379					3,379
Amortization of ESOP Award	1,636						1,636					1,636
Trustee Fees Paid in Shares							15					15
Trustee fees paid in shares units							1,336
Stock Issued During Period, Value, Stock Options Exercised	976						976					976
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period							230,294
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	1,746,739	0	40	0	96,850	1,666,341	(15,918)	(16,452)	21,238		1,746,739
Ending Balance, shares at Dec. 31, 2012			0	4,000,000	0	4,000,000	143,538,733
Beginning Balance at Sep. 30, 2012
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(26,698)
Preferred Stock, Value, Issued	40					96,850
Preferred Stock, Shares Issued	4,000,000					4,000,000
Ending Balance at Dec. 31, 2012	1,773,516	1,746,739				96,850	1,666,341	(15,918)	(16,452)	21,238	0	1,746,739
Ending Balance, shares at Dec. 31, 2012						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					0
Issuance of LP Units							181,289					181,289
Issuance of LP Units Shares							12,650,000
Preferred Stock, Value, Issued	40	96,850
Preferred Stock, Shares Issued	4,000,000	4,000,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	(744)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	946									946	(946)	(946)
Redemption of preferred shares, Value												361
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	361						361					(902)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures							27,918
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
Partners' Capital Account, Redemptions							17					17
Share Choice Plan Issuance Value							(160)					(160)
Share Choice Plan Issuance Shares							53,134
Stock Issued During Period, Value, Restricted Stock Award, Gross	(902)
Restricted Stock Amortization	3,079						3,079					3,079
Stock Issued During Period, Value, Vesting of restricted performance units	(159)						(902)
Stock Issued During Period, Shares, Vesting of restricted performance units							147,495
Restricted Performance Units Amortization	4,333						4,333					4,333
Amortization of ESOP Award	670						670					670
Trustee Fees Paid in Shares							20					20
Trustee fees paid in shares units							1,409
Stock Issued During Period, Value, Stock Options Exercised	2,380						2,380					2,380
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	236,318						236,318
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	$ 40	$ 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	0	4,000,000	156,731,993