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Fair Value (Details 3)
$ in Thousands
Dec. 31, 2017
USD ($)
derivative
Dec. 31, 2016
USD ($)
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units $ (1,338) $ (1,329)
Total (5,447,942) (4,219,956)
Recurring basis | Significant Other Observable Inputs (Level 2)    
Financial Instruments Measured/Discussed at Fair Value    
Total (1,848,750) (2,729,606)
Recurring basis | Significant Unobservable Inputs (Level 3)    
Financial Instruments Measured/Discussed at Fair Value    
Total (3,245) (6,002)
Recurring basis | Significant Unobservable Inputs (Level 3) | Puts    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts $ (3,245) (6,002)
Cash Flow Hedges Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Derivative, Number of Instruments Held | derivative 7  
Cash Flow 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
Cash Flow Hedges Interest Rate Caps | Recurring basis | Significant Other Observable Inputs (Level 2) | Interest Rate Swap [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets $ 2,270 14,775
Derivative Liability (1,171)  
Total Fair Value | Recurring basis    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units (1,338) (1,329)
Total (7,299,937) (6,955,564)
Total Fair Value | Recurring basis | Puts    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts (3,245) (6,002)
Total Fair Value | Cash Flow Hedges Interest Rate Caps | Recurring basis | Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets   2
Total Fair Value | Cash Flow Hedges Interest Rate Caps | Recurring basis | Interest Rate Swap [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 2,270 14,775
Derivative Liability $ (1,171)  
Non-designated Hedges Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Derivative, Number of Instruments Held | derivative 14  
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 79
Non-designated Hedges Interest Rate Caps | Total Fair Value | Recurring basis | Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 2 79
Secured Debt and Variable Rate Unsecured Term Loan [Member] | Recurring basis | Significant Other Observable Inputs (Level 2)    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (1,849,851) (2,744,462)
Secured Debt and Variable Rate Unsecured Term Loan [Member] | Total Fair Value | Recurring basis    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (1,849,851) (2,744,462)
Unsecured notes | Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (5,446,604) (4,218,627)
Unsecured notes | Total Fair Value | Recurring basis    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness $ (5,446,604) $ (4,218,627)