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Discontinued Operations (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Communities
Mar. 31, 2012
Communities
Apartment_Homes
Discontinued Operations (Textual) [Abstract]    
Communities sold (in communities) 0 6
Apartment homes sold (in apartment homes)   1,576
Communities held for sale (in communities) 0  
Discontinued operations, communities sold (in communities)   14
Discontinued operations, apartment homes sold (in apartment homes)   4,918
Summary of income from discontinued operations    
Rental income $ 0 $ 17,101
Rental expenses 0 5,929
Property management fee 0 470
Real estate depreciation 0 6,340
Total expenses 0 12,739
Income before net gain on the sale of property 0 4,362
Gain on the sale of depreciable property 0 80,525
Income from discontinued operations $ 0 $ 84,887