Investment in Real Estate (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 M	Dec. 31, 2010 M
In-Place Leases [Member]
Summary of intangible assets subject to amortization in the period of acquisition
Acquired finite lived intangible asset, fair value	$ 2,511	$ 1,782
Acquired finite lived intangible asset, weighted average life	56	100
Above Market Leases [Member]
Summary of intangible assets subject to amortization in the period of acquisition
Acquired finite lived intangible asset, fair value	2,883	239
Acquired finite lived intangible asset, weighted average life	56	88
Tenant Relationships [Member]
Summary of intangible assets subject to amortization in the period of acquisition
Acquired finite lived intangible asset, fair value	$ 1,553	$ 1,881
Acquired finite lived intangible asset, weighted average life	116	165