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Subsequent Events (Details)
1 Months Ended 9 Months Ended
Oct. 31, 2020
USD ($)
land_parcel
home
community
$ / shares
shares
Sep. 30, 2020
USD ($)
community
$ / shares
shares
Nov. 04, 2020
USD ($)
Dec. 31, 2019
USD ($)
Subsequent Event [Line Items]        
Treasury Stock, Shares, Acquired | shares   912,733    
Treasury Stock Acquired, Average Cost Per Share | $ / shares   $ 150.58    
Number Of Communities Held For Sale | community   0    
Credit Facility   $ 0   $ 0
Line of Credit [Member]        
Subsequent Event [Line Items]        
Credit Facility   $ 0   $ 0
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Treasury Stock, Shares, Acquired | shares 219,186      
Treasury Stock Acquired, Average Cost Per Share | $ / shares $ 148.17      
Number Of Communities Held For Sale | community 3      
Number of Land Parcels Acquired | land_parcel 3      
Payments to Acquire Land $ 59,145,000      
Subsequent Event [Member] | Line of Credit [Member]        
Subsequent Event [Line Items]        
Credit Facility     $ 183,000,000  
Subsequent Event [Member] | Subsequent Event Dispositions [Member]        
Subsequent Event [Line Items]        
Number of Apartment Homes Held For Sale | home 858      
Real Estate Investments, Net $ 126,397,000