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Revolving Credit Facilities and Term Loan (Tables)
6 Months Ended
Jun. 30, 2011
Revolving Credit Facilities and Term Loan (Tables) [Abstract]  
Information Regarding the Company's Revolving Credit Facilities and Term Loan
                         
            Weighted-    
    Carrying   Average Interest    
    Value at   Rate at    
    June 30, 2011   June 30, 2011   Maturity Date
Unsecured indebtedness:
                       
Unsecured Credit Facility
  $ 150.6       2.5 %   February 2016
PNC Facility
    20.0       1.8 %   February 2016
Secured indebtedness:
                       
Term loan
    500.0       3.0 %   September 2014