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Discontinued Operations (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
Dec. 31, 2015
Communities
Dec. 31, 2015
Dec. 31, 2015
USD ($)
Dec. 31, 2015
Apartment_Homes
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Communities
Gain/(loss) on sales of real estate owned, net of tax               $ 251,677,000   $ 143,572,000 $ 0
Document Period End Date         Dec. 31, 2015            
Gain (Loss) on Disposition of Property Plant Equipment               138,600,000      
Discontinued Operations (Textual) [Abstract]                      
Discontinued operations, number of communities sold | Communities           1         2
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax               0   75,000 $ 41,919,000
Proceeds from Sale of Property, Plant, and Equipment               408,700,000   328,400,000 $ 81,100,000
Number of communities sold           12 9        
Number of apartment homes sold             2,500   2,735   914
Impairment loss, net of tax               0   0 $ 1,470,000
Summary of income from discontinued operations                      
Rental income               0   147,000 9,152,000
Rental expenses               0   225,000 3,511,000
Property management fee               0   4,000 252,000
Real estate depreciation               0   0 1,958,000
Interest               0   21,000 (62,000)
Income before net gain on the sale of property               0   (103,000) 3,493,000
Impairment of Long-Lived Assets to be Disposed of               0   0 (2,355,000)
Income tax expense               0   38,000 885,000
Income/(loss) from discontinued operations, net of tax $ 0 $ 79,000 $ 18,000 $ (87,000)       0   10,000 43,942,000
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent               0   $ 10,000 $ 42,364,000
Land                      
Gain (Loss) on Disposition of Property Plant Equipment               1,100,000      
Operating Community [Member]                      
Gain (Loss) on Disposition of Property Plant Equipment               $ 142,500,000      
Discontinued Operations (Textual) [Abstract]                      
Number of communities sold             1