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Discontinued Operations (Details) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2013
Discontinued operations
Oct. 29, 2013
Discontinued operations
Commercial property in Richardson, Texas
Discontinued operations        
Gain (Loss) on sale of properties       $ 2,200,000
Operating results for the asset held for sale        
Rental revenue 61,597,000 42,842,000 305,000  
Real estate taxes and insurance (9,251,000) (6,595,000) (2,000)  
Depreciation and amortization (24,300,000) (15,781,000) (205,000)  
Income from discontinued operations   $ 98,000 $ 98,000