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Discontinued Operations and Properties Held for Sale (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Assets held for sale, net $ 812   $ 812   $ 1,818
Operating Loss for Properties Held for Sale $ 41 $ 9 $ 440 $ 9  
Vacant [Member] | Real Estate [Member]
         
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Real Estate Properties 1   1   2