Acquisitions (Details 1) (USD $)	3 Months Ended
	Mar. 31, 2012 Y
Intangible assets recorded in connection with the acquisitions
Intangible assets	$ 4,067,000
Weighted Average Amortization Period (in Years)	20.0
Leases, Acquired-in-Place [Member]
Intangible assets recorded in connection with the acquisitions
Intangible assets	2,820,000
Weighted Average Amortization Period (in Years)	5.4
Acquisitions (Textual) [Abstract]
Above-market value of leases	1,300,000
Tenant Relations [Member]
Intangible assets recorded in connection with the acquisitions
Intangible assets	$ 1,247,000
Weighted Average Amortization Period (in Years)	10.6