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Subsequent Events (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 1 Months Ended
Aug. 03, 2012
Jul. 19, 2012
Aug. 07, 2012
sqft
Property
Aug. 02, 2012
Building
sqft
Jul. 31, 2012
Building
sqft
Jul. 23, 2012
Building
sqft
Jul. 03, 2012
Building
sqft
Jun. 30, 2012
Dec. 31, 2011
Subsequent Events (Textual) [Abstract]                  
Number of industrial buildings acquired     2 1 1 1 3    
Square feet of industrial buildings acquired     203,291 24,277 103,200 74,679 171,707    
Purchase Price       $ 3.6 $ 14.2 $ 4.2 $ 33.7    
Shares offered in public offering   1,840,000           0 0
Type of preferred stock completed public offering   7.75% Series A Cumulative Redeemable Preferred Stock              
Number of shares sold upon the exercise of options   240,000              
Preferred offering of its preferred stock price per share   $ 25.00           $ 0.01 $ 0.01
Estimated net proceeds of the offering   44.3              
Other estimated offering expenses of approximately   $ 1.7              
Cash dividend declared, Common stock per share $ 0.12                
Cash dividend declared, Preferred stock series A $ 0.3875