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Discontinued Operations (Tables)
6 Months Ended
Jun. 30, 2011
Discontinued Operations [Abstract]  
Summary of income from discontinued operations
                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
 
                               
Rental income
  $ 451     $ 7,274     $ 7,258     $ 14,578  
Non-property income
                1       1,849  
 
                       
 
    451       7,274       7,259       16,427  
Rental expenses
    161       2,169       2,367       4,511  
Property management fee
    12       200       199       401  
Real estate depreciation
    54       3,472       2,651       6,940  
Interest
    64       769       817       1,540  
 
                       
 
    291       6,610       6,034       13,392  
Income before net gain on the sale of depreciable property
    160       664       1,225       3,035  
Net gain on the sale of depreciable property
    44,658       197       44,699       156  
 
                       
Income from discontinued operations
  $ 44,818     $ 861     $ 45,924     $ 3,191