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Fair Value (Details 3)
$ in Thousands
Dec. 31, 2018
USD ($)
derivative
Dec. 31, 2017
USD ($)
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units $ (1,305) $ (1,338)
Total (5,567,484) (5,447,942)
Recurring basis | Significant Other Observable Inputs (Level 2)    
Financial Instruments Measured/Discussed at Fair Value    
Total (1,214,338) (1,848,750)
Recurring basis | Significant Unobservable Inputs (Level 3)    
Financial Instruments Measured/Discussed at Fair Value    
Total (465) (3,245)
Recurring basis | Significant Unobservable Inputs (Level 3) | Puts    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts $ (465) (3,245)
Cash Flow Hedges Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Number of derivative instruments held | derivative 4  
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 assets   2,270
Derivative Liability $ (6,366) (1,171)
Total Fair Value | Recurring basis    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units (1,305) (1,338)
Total (6,782,287) (7,299,937)
Total Fair Value | Recurring basis | Puts    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts (465) (3,245)
Total Fair Value | Cash Flow Hedges Interest Rate Caps | Recurring basis | Interest Rate Swap    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets   2,270
Derivative Liability $ (6,366) (1,171)
Non-designated Hedges Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Number of derivative instruments held | derivative 10  
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 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 2
Unsecured notes | Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (5,566,179) (5,446,604)
Unsecured notes | Total Fair Value | Recurring basis    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (5,566,179) (5,446,604)
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 (1,207,974) (1,849,851)
Secured Notes Payable and Variable Rate Unsecured Term Loan | Total Fair Value | Recurring basis    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness $ (1,207,974) $ (1,849,851)