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Mortgages and Notes Payable (Tables)
 6 Months Ended
Jun. 30, 2011
Mortgages and Notes Payable [Abstract]  
Consolidated mortgages and notes payable
The following table sets forth our consolidated mortgages and notes payable:

   
June 30,
2011
 
December 31,
2010
 
Secured indebtedness                                                                                                      
 
$
748,563
 
$
754,399
 
Unsecured indebtedness                                                                                                      
   
866,505
   
768,546
 
Total mortgages and notes payable
 
$
1,615,068
 
$
1,522,945