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Commitment and Contingencies (Tables)
6 Months Ended
Jun. 30, 2011
Commitments and Contingencies [Abstract]  
Summary of the Companys real estate commitments
                         
    Number of     Costs Incurred     Expected Costs  
    Properties     to Date     to Complete  
 
                       
Wholly owned — under development
    5     $ 157,301     $ 268,624