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Real Estate income from operations of properties sold or held for sale (Tables)
 6 Months Ended
Jun. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Operating Results of Properties Classified as Discontinued Operations [Table Text Block]
Income from operations of properties sold or held for sale for the three and six months ended June 30, 2013 and 2012 were as follows (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
Revenues
$
—

 
$
1,187

 
347

 
2,472

Property expenses
—

 
(446
)
 
(162
)
 
(908
)
Depreciation and amortization
—

 
(364
)
 
—

 
(776
)
Interest expense
—

 
(63
)
 
—

 
(127
)
 
$
—

 
$
314

 
$
185

 
$
661