Investment in Real Estate (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 M	Mar. 31, 2011 M
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
Acquired finite lived intangible asset, weighted average life	118
Tenant Relationships [Member]
Summary of intangible assets subject to amortization in the period of acquisition
Acquired finite lived intangible asset, fair value	1,012
Acquired finite lived intangible asset, weighted average life	178
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