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Fair Value (Details 4) - Recurring basis - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Estimate of Fair Value Measurement    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units $ (1,565) $ (1,203)
Total (8,071,017) (8,312,664)
Unsecured notes | Estimate of Fair Value Measurement    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (7,061,205) (7,271,799)
Secured Debt and Variable Rate Unsecured Indebtedness | Estimate of Fair Value Measurement    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (1,007,522) (1,043,976)
Interest Rate Cap | Not Designated as Hedging Instrument | Estimate of Fair Value Measurement    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 97 6
Interest Rate Swap | Cash Flow Hedges | Estimate of Fair Value Measurement    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 88 4,308
Derivative liability (910)  
Fair Value, Inputs, Level 1    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units (1,565) (1,203)
Total (7,062,770) (7,273,002)
Fair Value, Inputs, Level 1 | Unsecured notes    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (7,061,205) (7,271,799)
Fair Value, Inputs, Level 2    
Financial Instruments Measured/Discussed at Fair Value    
Total (1,008,247) (1,039,662)
Fair Value, Inputs, Level 2 | Secured Debt and Variable Rate Unsecured Indebtedness    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (1,007,522) (1,043,976)
Fair Value, Inputs, Level 2 | Interest Rate Cap | Not Designated as Hedging Instrument    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 97 6
Fair Value, Inputs, Level 2 | Interest Rate Swap | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 88 4,308
Derivative liability (910)  
Fair Value, Inputs, Level 3    
Financial Instruments Measured/Discussed at Fair Value    
Total $ 0 $ 0