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Mortgage Notes Payable (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
property
Debt Instrument [Line Items]    
Mortgage notes payable $ 643,550,000 $ 990,667,000
Number of properties securing mortgage notes | property 12 24
Weighted average interest rate 2.70% 4.10%
Unamortized debt issuance expense $ 1,800,000 $ 2,600,000
Monthly interest expense 3,000,000.0  
Monthly principal amortization 500,000  
Mortgage notes payable, net $ 643,550,000 $ 990,667,000
Repayment of debt before the scheduled maturity date, prepayment penalties The prepayment penalty on the majority of the Company’s mortgage notes payable are computed by the greater of (a) 1% of the amount of the principal being prepaid or (b) the present value of the principal being prepaid multiplied by the difference between the interest rate of the mortgage note and the stated yield rate on a U.S. treasury security which generally has an equivalent remaining term as the mortgage note.  
Minimum    
Debt Instrument [Line Items]    
Remaining terms 1 year 1 year
Maximum    
Debt Instrument [Line Items]    
Remaining terms 26 years 27 years
Fixed Rate Mortgage Notes Payable    
Debt Instrument [Line Items]    
Mortgage notes payable $ 419,323,000 $ 736,490,000
Prepayment penalty, percent of principal prepaid 1.00%  
Fixed Rate Mortgage Notes Payable | Total Return Swap Callable | Not Designated as Hedging Instrument    
Debt Instrument [Line Items]    
Derivative notional amount $ 225,100,000  
Variable Rate Mortgage Notes Payable    
Debt Instrument [Line Items]    
Mortgage notes payable 224,227,000 $ 254,177,000
Derivative notional amount $ 254,800,000  
Multifamily housing mortgage revenue bonds, variable interest rate (in hundredths) 1.20% 2.30%
Percentage of units subject to tenant income criteria (in hundredths) 20.00%  
Secured Debt    
Debt Instrument [Line Items]    
Mortgage notes payable $ 641,426,000  
Debt instrument, unamortized premium 3,900,000 $ 5,900,000
Secured Deeds of Trust    
Debt Instrument [Line Items]    
Mortgage notes payable, net $ 0 $ 0