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Fair Value (Details 4) - Recurring basis - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Estimate of Fair Value Measurement    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units $ (1,524) $ (1,305)
Total (7,521,298) (6,782,287)
Estimate of Fair Value Measurement | Unsecured notes    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (6,097,629) (5,268,277)
Estimate of Fair Value Measurement | Secured Debt and Variable Rate Unsecured Indebtedness    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (1,417,624) (1,505,876)
Estimate of Fair Value Measurement | Interest Rate Cap | Not Designated as Hedging Instrument    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets   2
Estimate of Fair Value Measurement | Interest Rate Swap | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 18  
Derivative liability (4,198) (6,366)
Estimate of Fair Value Measurement | Put Option    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts (341) (465)
Fair Value, Inputs, Level 1    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units (1,524) (1,305)
Total (6,099,153) (5,269,582)
Fair Value, Inputs, Level 1 | Unsecured notes    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (6,097,629) (5,268,277)
Fair Value, Inputs, Level 2    
Financial Instruments Measured/Discussed at Fair Value    
Total (1,421,804) (1,512,240)
Fair Value, Inputs, Level 2 | Secured Debt and Variable Rate Unsecured Indebtedness    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (1,417,624) (1,505,876)
Fair Value, Inputs, Level 2 | Interest Rate Cap | Not Designated as Hedging Instrument    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets   2
Fair Value, Inputs, Level 2 | Interest Rate Swap | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 18  
Derivative liability (4,198) (6,366)
Fair Value, Inputs, Level 3    
Financial Instruments Measured/Discussed at Fair Value    
Total (341) (465)
Fair Value, Inputs, Level 3 | Put Option    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts $ (341) $ (465)