Derivatives and Other Financial Instruments (Summary of Amount of Gain/(Loss) Recognized in Income as Loss on Derivative Instruments) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Amount of gain/(loss) recognized in accumulated other comprehensive income	$ 362	$ (416)	$ (624)	$ (360)
Total (loss)/gain on derivative instruments	383	(497)	(628)	(347)
Interest Rate Swaps [Member]
Amount of gain/(loss) recognized in accumulated other comprehensive income	372		(79)	56
Ineffective Interest Rate Swaps [Member]
Amount of gain/(loss) recognized in accumulated other comprehensive income	(10)	(416)	(545)	(416)
Other [Member]
Total (loss)/gain on derivative instruments	21	(81)	(4)	13
BIOMED REALTY TRUST, INC. [Member]
Total (loss)/gain on derivative instruments	$ 383	$ (497)	$ (628)	$ (347)