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Fair Value (Details 4) - Recurring basis - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Estimate of Fair Value Measurement    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units $ (1,120) $ (1,573)
Total (8,342,839) (7,603,688)
Estimate of Fair Value Measurement | Unsecured notes    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (7,269,443) (6,197,771)
Estimate of Fair Value Measurement | Secured Debt and Variable Rate Unsecured Indebtedness    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (1,073,689) (1,398,147)
Estimate of Fair Value Measurement | Interest Rate Swap | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 1,413 388
Derivative liability   (6,379)
Estimate of Fair Value Measurement | Put Option    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts   (206)
Fair Value, Inputs, Level 1    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units (1,120) (1,573)
Total (7,270,563) (6,199,344)
Fair Value, Inputs, Level 1 | Unsecured notes    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (7,269,443) (6,197,771)
Fair Value, Inputs, Level 2    
Financial Instruments Measured/Discussed at Fair Value    
Total (1,072,276) (1,404,138)
Fair Value, Inputs, Level 2 | Secured Debt and Variable Rate Unsecured Indebtedness    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (1,073,689) (1,398,147)
Fair Value, Inputs, Level 2 | Interest Rate Swap | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 1,413 388
Derivative liability   (6,379)
Fair Value, Inputs, Level 3    
Financial Instruments Measured/Discussed at Fair Value    
Total $ 0 (206)
Fair Value, Inputs, Level 3 | Put Option    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts   $ (206)