Investment in Real Estate (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
In-Place Leases [Member]
Summary of intangible assets subject to amortization in the period of acquisition
Acquired finite lived intangible asset, fair value	$ 1,750	$ 2,511
Acquired finite lived intangible asset, weighted average life	118 months	56 months
Tenant Relationships [Member]
Summary of intangible assets subject to amortization in the period of acquisition
Acquired finite lived intangible asset, fair value	1,012	1,553
Acquired finite lived intangible asset, weighted average life	178 months	116 months
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
Acquired finite lived intangible asset, weighted average life		56 months
Below Market Leases [Member]
Summary of intangible assets subject to amortization in the period of acquisition
Acquired finite lived intangible asset, fair value	$ (102)
Acquired finite lived intangible asset, weighted average life	118 months