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Subsequent Events (Details)
$ in Thousands
1 Months Ended
May. 03, 2016
USD ($)
Apr. 30, 2016
USD ($)
land_parcel
home
Mar. 31, 2016
USD ($)
home
Subsequent events      
Estimated number of apartment homes in communities to be developed | home     9,745
Subsequent event      
Subsequent events      
Number Of Land Parcels Acquired | land_parcel   2  
Payments to Acquire Land   $ 28,725  
Estimated number of apartment homes in communities to be developed | home   633  
Real Estate Investment Property, Projected Capital Cost To Develop Real Estate   $ 234,000  
Cash Flow Hedges | Interest Rate Swap [Member]      
Subsequent events      
Notional amount     $ 1,050,000
Cash Flow Hedges | Interest Rate Swap [Member] | Subsequent event      
Subsequent events      
Notional amount $ 150,000    
Mortgage notes payable | Notes Payable Maturities 2046 [Member] [Domain] | Subsequent event      
Subsequent events      
Repayments of secured mortgages $ 134,500