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Discontinued Operations (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2013
Discontinued operations
Jun. 30, 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 60,994,000 46,017,000 122,591,000 88,859,000 306,000 611,000  
Real estate taxes and insurance (9,763,000) (7,308,000) (19,014,000) (13,903,000) (3,000) (5,000)  
Depreciation and amortization (23,563,000) (16,921,000) (47,863,000) (32,702,000) (205,000) (410,000)  
Income from discontinued operations   $ 98,000   $ 196,000 $ 98,000 $ 196,000