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Discontinued Operations (UNITED DOMINION REALTY, L.P.) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Communities
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
Communities
Dec. 31, 2015
Dec. 31, 2015
USD ($)
Dec. 31, 2015
Apartment_Homes
Dec. 31, 2014
USD ($)
Communities
Dec. 31, 2013
USD ($)
Communities
Apartment_Homes
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Gain (Loss) on Disposition of Property Plant Equipment             $ 138,600      
Discontinued Operations (Textual) [Abstract]                    
Number of communities sold         12 9        
Number of apartment homes sold           2,500   2,735   914
Proceeds from Sale of Property, Plant, and Equipment             408,700   $ 328,400 $ 81,100
Summary of income from discontinued operations                    
Rental income             0   147 9,152
Rental expenses             0   225 3,511
Property management fee             0   4 252
Real estate depreciation             0   0 1,958
Interest             0   21 (62)
Income before net gain on the sale of property             0   (103) 3,493
Income/(loss) from discontinued operations $ 0 $ 79 $ 18 $ (87)     0   10 $ 43,942
United Dominion Reality L.P.                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Gain (Loss) on Disposition of Property Plant Equipment                 $ 24,400  
Discontinued Operations (Textual) [Abstract]                    
Number of communities sold           5     1 2
Number of apartment homes sold | Apartment_Homes               1,149   914
Proceeds from Sale of Property, Plant, and Equipment             250,900   $ 48,700 $ 81,100
Number of communities held for sale | Communities 0               0  
Summary of income from discontinued operations                    
Rental income             0   $ 0 8,989
Rental expenses             0   0 3,149
Property management fee             0   0 247
Real estate depreciation             0   0 1,935
Income before net gain on the sale of property             0   0 3,658
Net (loss)/gain on the sale of depreciable property             0   0 41,518
Income/(loss) from discontinued operations             0   $ 0 $ 45,176
Operating Community [Member]                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Gain (Loss) on Disposition of Property Plant Equipment             142,500      
Discontinued Operations (Textual) [Abstract]                    
Number of communities sold           1        
Operating Community [Member] | United Dominion Reality L.P.                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Gain (Loss) on Disposition of Property Plant Equipment             62,500      
Land                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Gain (Loss) on Disposition of Property Plant Equipment             1,100      
Land | United Dominion Reality L.P.                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Gain (Loss) on Disposition of Property Plant Equipment             $ 1,100