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Significant Acquisitions (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
sqft
Dec. 31, 2011
Significant Acquisitions    
Rental area of properties acquired (in square feet) 629,000  
Aggregate purchase price of properties acquired, excluding closing costs and adjustments $ 154,800,000  
Acquisition costs 156,000  
Estimated fair value of assets acquired at the date of acquisition    
Real estate assets 130,000,000  
Value of acquired real estate leases 24,947,000  
Acquired unfavorable leases (2,022,000)  
Total 152,925,000  
Pro forma operating results for the company and acquisitions    
Revenue 176,684,000 155,313,000
Income from continuing operations 20,446,000 15,776,000
Net income 4,738,000 41,320,000
Weighted average shares outstanding (in shares) 82,937 81,857
Income from continuing operations per share (in dollars per share) $ 0.25 $ 0.19
Net income per share (in dollars per share) $ 0.06 $ 0.50
Revenue recognized due to the acquisitions 3,000,000  
Net income from operations recognized due to the acquisitions $ 2,000,000  
Texas
   
Significant Acquisitions    
Number of properties acquired 1