Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended
Sep. 16, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Accumulated other comprehensive income (loss) [Line Items]
Balance at January 1,		$ (2,995)
Change during year		(1,190)	12,789	(7,338)
Loss on settlement of interest rate swaps	(800)	(828)	0	(2,985)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net		388	286	297
Balance at December 31,		(4,607)	(2,995)
Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of Accumulated other comprehensive income (loss) [Line Items]
Balance at January 1,		(2,995)	(15,918)	(6,079)
Change during year		(1,190)	12,789	(7,338)
Non-controlling interest- consolidated real estate venture partner's share of unrealized (gains)/losses on derivative financial instruments		18	(152)	187
Loss on settlement of interest rate swaps		(828)		(2,985)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net		388	286	297
Balance at December 31,		(4,607)	(2,995)	(15,918)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Schedule of Accumulated other comprehensive income (loss) [Line Items]
Balance at January 1,		(3,377)
Change during year		(1,190)	12,789	(7,338)
Loss on settlement of interest rate swaps		(828)	0	(2,985)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net		388	286	297
Balance at December 31,		(5,007)	(3,377)
BRANDYWINE OPERATING PARTNERSHIP, L.P. \| Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of Accumulated other comprehensive income (loss) [Line Items]
Balance at January 1,		(3,377)	(16,452)	(6,426)
Change during year		(1,190)	12,789	(7,338)
Loss on settlement of interest rate swaps		(828)		(2,985)
Reclassification of realized (gains)/losses on derivative financial instruments to operations, net		388	286	297
Balance at December 31,		$ (5,007)	$ (3,377)	$ (16,452)

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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