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Discontinued Operations (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Dec. 31, 2012
item
Discontinued Operations      
Number of properties sold     5
Discontinued Operations      
Rental income $ 543 $ 1,093  
Depreciation and amortization 101 211  
Real estate expenses 42 102  
Interest expense 117 233  
Total expenses 260 546  
Income from operations 283 547  
Net gain on sales 2,205 2,205  
Income from discontinued operations $ 2,488 $ 2,752