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Fair Value (Details 3)
$ in Thousands
Dec. 31, 2019
USD ($)
derivative
Dec. 31, 2018
USD ($)
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units $ (1,573) $ (1,305)
Total (6,199,344) (5,269,582)
Recurring basis | Significant Other Observable Inputs (Level 2)    
Financial Instruments Measured/Discussed at Fair Value    
Total (1,404,138) (1,512,240)
Recurring basis | Significant Unobservable Inputs (Level 3)    
Financial Instruments Measured/Discussed at Fair Value    
Total (206) (465)
Recurring basis | Significant Unobservable Inputs (Level 3) | Puts    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts $ (206) (465)
Cash Flow Hedges Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Number of derivative instruments held | derivative 6  
Cash Flow Hedges Interest Rate Caps | Recurring basis | Significant Other Observable Inputs (Level 2) | Interest Rate Swap    
Financial Instruments Measured/Discussed at Fair Value    
Derivative Liability $ (6,379) (6,366)
Total Fair Value | Recurring basis    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units (1,573) (1,305)
Total (7,603,688) (6,782,287)
Total Fair Value | Recurring basis | Puts    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts (206) (465)
Total Fair Value | Cash Flow Hedges Interest Rate Caps | Recurring basis | Interest Rate Swap    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 388  
Derivative Liability $ (6,379) (6,366)
Non-designated Hedges Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Number of derivative instruments held | derivative 5  
Non-designated Hedges Interest Rate Caps | Recurring basis | Significant Other Observable Inputs (Level 2) | Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets   2
Non-designated Hedges Interest Rate Caps | Total Fair Value | Recurring basis | Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets   2
Unsecured notes | Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness $ (6,197,771) (5,268,277)
Unsecured notes | Total Fair Value | Recurring basis    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (6,197,771) (5,268,277)
Secured Notes Payable and Variable Rate Unsecured Term Loan | Recurring basis | Significant Other Observable Inputs (Level 2)    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (1,398,147) (1,505,876)
Secured Notes Payable and Variable Rate Unsecured Term Loan | Total Fair Value | Recurring basis    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness $ (1,398,147) $ (1,505,876)