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Subsequent Events (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2019
USD ($)
home
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
May 03, 2019
USD ($)
Dec. 31, 2018
USD ($)
Subsequent Event [Line Items]          
Payments to Acquire Other Real Estate   $ 91,548,000 $ 0    
Credit Facility   0     $ 0
Line of Credit [Member]          
Subsequent Event [Line Items]          
Credit Facility   $ 0     $ 0
Line of Credit [Member] | Subsequent Event          
Subsequent Event [Line Items]          
Credit Facility       $ 211,000,000  
Secured notes | Notes Payable Maturities 2019, Fixed Rate [Member] | Subsequent Event          
Subsequent Event [Line Items]          
Repayments of secured mortgages $ 13,394,000        
Debt Instrument, Interest Rate, Stated Percentage 4.63894%        
Secured notes | Notes Payable Maturities 2019, Variable Rate [Member] | Subsequent Event          
Subsequent Event [Line Items]          
Repayments of secured mortgages $ 33,929,000        
Avalon Cerritos [Member] | Subsequent Event          
Subsequent Event [Line Items]          
Number of Apartment Homes Acquired | home 132        
Payments to Acquire Other Real Estate $ 60,500,000        
Archstone Toscano [Member] | Subsequent Event          
Subsequent Event [Line Items]          
Number of Apartment Homes Sold | home 474        
Proceeds from sale of real estate $ 98,000,000