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Investments in Real Estate (Details Textual) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Building
sqft
Jun. 30, 2011
sqft
Building
Jun. 30, 2012
sqft
Building
Jun. 30, 2011
sqft
Building
Investments in Real Estate (Textual) [Abstract]        
Total aggregate initial investment $ 68.7 $ 55.9 $ 74.8 $ 61.7
Investments in Real Estate (Additional Textual) [Abstract]        
Number of industrial buildings 6 5 7 6
Square feet 706,909 400,078 775,898 535,078
Revenues 0.6   0.6  
Net income 0.2   0.2  
Land [Member]
        
Investments in Real Estate (Textual) [Abstract]        
Total aggregate initial investment 35.3 27.5 37.2 30.7
Building and improvements [Member]
        
Investments in Real Estate (Textual) [Abstract]        
Total aggregate initial investment 30.6 25.8 34.3 28.1
Intangible assets [Member]
        
Investments in Real Estate (Textual) [Abstract]        
Total aggregate initial investment 2.8 2.6 3.3 2.9
Intangible liabilities [Member]
        
Investments in Real Estate (Textual) [Abstract]        
Total aggregate initial investment $ 0.2    $ 0.2