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Fair Value (Details 2)
$ in Thousands
Dec. 31, 2015
USD ($)
derivative
Dec. 31, 2014
USD ($)
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units $ (1,381) $ (1,226)
Total (3,669,798) (2,875,373)
Recurring basis | Significant Other Observable Inputs (Level 2)    
Financial Instruments Measured/Discussed at Fair Value    
Total (2,694,888) (3,683,767)
Recurring basis | Significant Unobservable Inputs (Level 3)    
Financial Instruments Measured/Discussed at Fair Value    
Total (8,181) (11,104)
Recurring basis | Significant Unobservable Inputs (Level 3) | Puts    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts $ (8,181) (11,104)
Cash Flow Hedges Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Derivative, Number of Instruments Held | derivative 10  
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 $ 5 58
Total Fair Value | Recurring basis    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units (1,381) (1,226)
Total (6,372,867) (6,570,244)
Total Fair Value | Recurring basis | Puts    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts (8,181) (11,104)
Total Fair Value | Cash Flow Hedges Interest Rate Caps | Recurring basis | Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 5 58
Total Fair Value | Cash Flow Hedges Interest Rate Caps | Recurring basis | Interest Rate Swap [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets $ 5,422  
Non-designated Hedges Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Derivative, Number of Instruments Held | derivative 15  
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 $ 26 50
Non-designated Hedges Interest Rate Caps | Total Fair Value | Recurring basis | Interest Rate Caps    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 26 50
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 (2,700,341) (3,683,875)
Secured Debt and Variable Rate Unsecured Term Loan [Member] | Total Fair Value | Recurring basis    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (2,700,341) (3,683,875)
Unsecured notes | Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (3,668,417) (2,874,147)
Unsecured notes | Total Fair Value | Recurring basis    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness $ (3,668,417) $ (2,874,147)