Property Transactions (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Business acquisition cost of acquired entity purchase price allocation
Business acquisition purchase price allocation tangible assets, land	$ 13,439
Business acquisition purchase price allocation tangible assets, building	94,190
Business acquisition purchase price allocation tangible assets tenant improvements and FF&E	8,600
Tangible Assets	116,229
Business acquisition purchase price allocation amortizable intangible assets above market leases	3,991
Business acquisition purchase price allocation amortizable intangible assets in place leases	16,172
Business acquisition, purchase price allocation, amortizable intangible assets	20,163
Business acquisition purchase price allocation amortizable intangible liabilities below market lease	(1,659)
Total net Assets Acquired	$ 134,733