Acquisitions, Dispositions, Leasing and Financing Activities (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Intangible assets acquired and intangible liabilities assumed
Intangible assets carrying value	$ 5,126
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period	5 years 7 months 6 days
In place lease intangibles [Member]
Intangible assets acquired and intangible liabilities assumed
Intangible assets carrying value	2,872
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period	2 years 6 months
Above market intangibles [Member]
Intangible assets acquired and intangible liabilities assumed
Intangible assets carrying value	641
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period	5 years
Tenant relationship value [Member]
Intangible assets acquired and intangible liabilities assumed
Intangible assets carrying value	1,260
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period	10 years
Lease commissions, legal and marketing fees [Member]
Intangible assets acquired and intangible liabilities assumed
Intangible assets carrying value	353
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period	5 years
Below market ground lease assumed [Member]
Intangible assets acquired and intangible liabilities assumed
Intangible assets carrying value	$ (54)
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period	5 years