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Fair Value (Details 4) - Recurring basis - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Estimate of Fair Value Measurement    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units $ (1,104) $ (1,573)
Total (8,197,190) (7,603,688)
Estimate of Fair Value Measurement | Unsecured notes    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (6,030,476) (6,197,771)
Estimate of Fair Value Measurement | Secured Debt and Variable Rate Unsecured Indebtedness    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (2,162,216) (1,398,147)
Estimate of Fair Value Measurement | Interest Rate Cap | Not Designated as Hedging Instrument    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 9  
Estimate of Fair Value Measurement | Interest Rate Swap | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 22 388
Derivative liability (3,302) (6,379)
Estimate of Fair Value Measurement | Put Option    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts (123) (206)
Fair Value, Inputs, Level 1    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units (1,104) (1,573)
Total (6,031,580) (6,199,344)
Fair Value, Inputs, Level 1 | Unsecured notes    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (6,030,476) (6,197,771)
Fair Value, Inputs, Level 2    
Financial Instruments Measured/Discussed at Fair Value    
Total (2,165,487) (1,404,138)
Fair Value, Inputs, Level 2 | Secured Debt and Variable Rate Unsecured Indebtedness    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (2,162,216) (1,398,147)
Fair Value, Inputs, Level 2 | Interest Rate Cap | Not Designated as Hedging Instrument    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 9  
Fair Value, Inputs, Level 2 | Interest Rate Swap | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 22 388
Derivative liability (3,302) (6,379)
Fair Value, Inputs, Level 3    
Financial Instruments Measured/Discussed at Fair Value    
Total (123) (206)
Fair Value, Inputs, Level 3 | Put Option    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts $ (123) $ (206)