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Discontinued Operations (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Communities
Apartment_Homes
Jun. 30, 2011
Communities
Apartment_Homes
Jun. 30, 2012
Apartment_Homes
Communities
Jun. 30, 2011
Communities
Apartment_Homes
Discontinued Operations (Textual) [Abstract]        
Communities sold (in communities) 15 7 21 6
Apartment homes sold (in apartment homes) 4,931 1,707 6,507 1,418
Communities held for sale (in communities) 0   0  
Discontinued operations, communities sold (in communities)   11    
Discontinued operations, apartment homes sold (in apartment homes)   2,781    
Summary of income from discontinued operations        
Rental income $ 13,215,000 $ 26,581,000 $ 30,316,000 $ 59,271,000
Rental expenses 4,637,000 9,989,000 10,566,000 22,102,000
Other operating expenses 0 0 0 23,000
Property management fee 364,000 731,000 834,000 1,630,000
Real estate depreciation 0 11,253,000 6,340,000 25,153,000
Interest 0 184,000 0 1,744,000
Non-property expense 791,000 43,000 791,000 88,000
Total expenses 5,792,000 22,200,000 18,531,000 50,740,000
Income before net gain on the sale of property 7,423,000 4,381,000 11,785,000 8,531,000
Gain on the sale of depreciable property 180,856,000 44,658,000 261,381,000 44,699,000
Income tax expense (8,850,000) 0 (8,850,000) 0
Income from discontinued operations $ 179,429,000 $ 49,039,000 $ 264,316,000 $ 53,230,000