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Business (Tables)
 6 Months Ended
Jun. 30, 2011
Business [Abstract]  
Property/Unit schedule
                 
    Properties     Apartment Units  
Wholly Owned Properties
    397       111,539  
Partially Owned Properties — Consolidated
    22       4,371  
Military Housing
    2       4,850  
 
           
 
    421       120,760