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Fair Value (Details 3)
$ in Thousands
Dec. 31, 2020
USD ($)
derivative
Dec. 31, 2019
USD ($)
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units $ (1,203) $ (1,573)
Total (7,273,002) (6,199,344)
Recurring basis | Significant Other Observable Inputs (Level 2)    
Financial Instruments Measured/Discussed at Fair Value    
Total (1,039,662) (1,404,138)
Recurring basis | Significant Unobservable Inputs (Level 3)    
Financial Instruments Measured/Discussed at Fair Value    
Total 0 0
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)
Total Fair Value | Recurring basis    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units (1,203) (1,573)
Total (8,312,664) (7,603,482)
Total Fair Value | Cash Flow Hedges Interest Rate Caps | Recurring basis | Interest Rate Swap    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets $ 4,308 388
Derivative Liability   (6,379)
Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Number of derivative instruments held | derivative 10  
Interest Rate Caps | Recurring basis | Significant Other Observable Inputs (Level 2) | Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets $ 6  
Interest Rate Caps | Total Fair Value | Recurring basis | Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 6  
Unsecured notes | Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (7,271,799) (6,197,771)
Unsecured notes | Total Fair Value | Recurring basis    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (7,271,799) (6,197,771)
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 (1,043,976) (1,398,147)
Secured Notes Payable and Variable Rate Unsecured Term Loan | Total Fair Value | Recurring basis    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness $ (1,043,976) $ (1,398,147)