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Subsequent Events (Details)
$ in Thousands
1 Months Ended
Jan. 31, 2019
USD ($)
home
Feb. 22, 2019
USD ($)
home
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Subsequent events        
Variable rate unsecured credit facility     $ 0 $ 0
Net real estate     $ 17,730,930 $ 17,717,557
Variable rate unsecured credit facility | Subsequent event        
Subsequent events        
Variable rate unsecured credit facility   $ 106,000    
Subsequent Event Dispositions | Subsequent event        
Subsequent events        
Apartment homes | home 184      
Net cash proceeds $ 70,000      
Archstone Toscano | Subsequent event        
Subsequent events        
Number of apartment homes held for sale | home   474    
Net real estate   $ 76,573