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Discontinued Operations and Properties Held for Sale (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
property
Sep. 30, 2011
property
Dec. 31, 2011
Discontinued Operations and Properties Held for Sale          
Total sales price, net of closing costs     $ 24,823,000 $ 11,544,000  
Discontinued operations and properties held for sale          
Related assets of properties held for sale 87,000   87,000   502,000
Net book value of properties held for sale 3,173,000   3,173,000   10,986,000
Number of properties whose operations are included in discontinued operations     4    
Number of properties sold whose net gain and operations are included in discontinued operations     3 1  
Discontinued Operations and Properties Held for Sale          
Rental income 381,000 395,000 1,222,000 1,527,000  
Depreciation and amortization 17,000 89,000 187,000 331,000  
Real estate expenses   67,000 101,000 198,000  
Interest expense 100,000 117,000 332,000 352,000  
Total expenses 117,000 273,000 620,000 881,000  
Income from operations 264,000 122,000 602,000 646,000  
Net gain on sales 15,050,000   17,254,000 932,000  
Income from discontinued operations 15,314,000 122,000 17,856,000 1,578,000  
Property in Texas
          
Discontinued operations and properties held for sale          
Agreed sale price of property held for sale 5,000,000   5,000,000    
Estimated gain on sale of property held for sale     1,650,000    
Related assets of properties held for sale 87,000   87,000    
Net book value of properties held for sale $ 3,173,000   $ 3,173,000    
Property in New York
          
Discontinued operations and properties held for sale          
Number of properties located in New York sold     2