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Mortgage Notes Payable, Unsecured Notes and Credit Facility (Details 2) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Notes Payable, Unsecured Notes and Credit Facility            
Repayments of Unsecured Debt       $ 958,680,000 $ 0  
Gain (Loss) on Extinguishment of Debt $ (268,000)   $ (229,000) (9,438,000) $ (509,000)  
Credit Facility 0     0   $ 0
Net carrying value of apartment communities and improved land parcels securing debt 1,576,478,000     1,576,478,000    
Unsecured Notes 2.45 Percent [Member]            
Notes Payable, Unsecured Notes and Credit Facility            
Debt Instrument, Face Amount 600,000,000     600,000,000    
Proceeds from Issuance of Debt 593,430,000          
Secured Debt [Member]            
Notes Payable, Unsecured Notes and Credit Facility            
Long-term Debt, Percentage Bearing Fixed Interest, Amount 478,070,000     478,070,000   479,221,000
Unsecured notes            
Notes Payable, Unsecured Notes and Credit Facility            
Long-term Debt, Percentage Bearing Fixed Interest, Amount $ 6,500,000,000     6,500,000,000   5,850,000,000
Unsecured Notes 2.30 Percent [Member]            
Notes Payable, Unsecured Notes and Credit Facility            
Debt Instrument, Face Amount   $ 700,000,000        
Proceeds from Issuance of Debt   $ 694,701,000        
Unsecured Notes 2.30 Percent [Member] | Unsecured notes            
Notes Payable, Unsecured Notes and Credit Facility            
Debt Instrument, Interest Rate, Stated Percentage   2.30%        
Floating Rate Unsecured Notes 300 Million [Member] | Unsecured notes            
Notes Payable, Unsecured Notes and Credit Facility            
Repayments of Unsecured Debt       300,000,000    
Gain (Loss) on Extinguishment of Debt       $ 268,000    
Notes Payable 3.625 Maturities 2020 and 2021 [Member] | Unsecured notes            
Notes Payable, Unsecured Notes and Credit Facility            
Gain (Loss) on Extinguishment of Debt   $ 9,170,000        
Unsecured Notes 2.45 Percent [Member] | Unsecured notes            
Notes Payable, Unsecured Notes and Credit Facility            
Debt Instrument, Interest Rate, Stated Percentage 2.45%     2.45%    
Notes Payable Maturities 2021 [Member] | Unsecured notes            
Notes Payable, Unsecured Notes and Credit Facility            
Debt Instrument, Interest Rate, Stated Percentage   3.95%        
Repayments of Unsecured Debt   $ 250,000,000        
Notes Payable Maturities 2020 [Member]            
Notes Payable, Unsecured Notes and Credit Facility            
Debt Instrument, Interest Rate, Stated Percentage   3.08%        
Line of Credit [Member]            
Notes Payable, Unsecured Notes and Credit Facility            
Available borrowing capacity $ 1,750,000,000     $ 1,750,000,000    
Annual facility fee, percentage       0.125%    
Annual facility fee       $ 2,188,000    
Credit Facility 0     0   0
Outstanding balance of letters of credit $ 4,952,000     $ 4,952,000   11,488,000
Line of Credit [Member] | LIBOR            
Notes Payable, Unsecured Notes and Credit Facility            
Debt instrument, basis spread on variable rate (as a percent)       0.775%    
Current interest rate (as a percent) 0.94%     0.94%    
Other Letter of Credit [Member]            
Notes Payable, Unsecured Notes and Credit Facility            
Outstanding balance of letters of credit $ 32,322,000     $ 32,322,000   $ 24,939,000
Fixed Rate Mortgage Notes Payable [Member]            
Notes Payable, Unsecured Notes and Credit Facility            
Weighted average interest rate, debt (as a percent) 3.80%     3.80%   3.90%
Notes Payable Maturities 2027            
Notes Payable, Unsecured Notes and Credit Facility            
Debt Instrument, Interest Rate, Stated Percentage   2.38%        
Notes Payable Maturities 2027 | Unsecured notes            
Notes Payable, Unsecured Notes and Credit Facility            
Debt Instrument, Interest Rate, Stated Percentage 3.35%     3.35%    
Notes Payable 3.625 Maturities 2020 [Member] | Unsecured notes            
Notes Payable, Unsecured Notes and Credit Facility            
Debt Instrument, Interest Rate, Stated Percentage   3.625%        
Repayments of Unsecured Debt   $ 400,000,000        
Variable Rate Mortgage Notes Payable Unsecured Term Loan and Credit Facility [Member]            
Notes Payable, Unsecured Notes and Credit Facility            
Weighted average interest rate, debt (as a percent) 1.70%     1.70%   3.20%
Avalon San Bruno III [Member] | Notes Payable Maturities 2027 | Secured Debt [Member]            
Notes Payable, Unsecured Notes and Credit Facility            
Long-term Debt, Percentage Bearing Fixed Interest, Amount   $ 51,000,000