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Fair Value (Details 3) - Recurring basis - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Estimate of Fair Value Measurement [Member]    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units $ (1,334) $ (1,381)
Total (7,036,547) (6,372,867)
Estimate of Fair Value Measurement [Member] | Unsecured notes    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (3,988,324) (3,668,417)
Estimate of Fair Value Measurement [Member] | Secured Debt and Variable Rate Unsecured Term Loan [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (2,985,133) (2,700,341)
Estimate of Fair Value Measurement [Member] | Interest Rate Cap [Member] | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 0 5
Estimate of Fair Value Measurement [Member] | Interest Rate Cap [Member] | Not Designated as Hedging Instrument [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 16 26
Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member] | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets (53,591) 5,422
Estimate of Fair Value Measurement [Member] | Put Option [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts (8,181) (8,181)
Fair Value, Inputs, Level 1 [Member]    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units (1,334) (1,381)
Total (3,989,658) (3,669,798)
Fair Value, Inputs, Level 1 [Member] | Unsecured notes    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (3,988,324) (3,668,417)
Fair Value, Inputs, Level 2 [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Total (3,038,708) (2,694,888)
Fair Value, Inputs, Level 2 [Member] | Secured Debt and Variable Rate Unsecured Term Loan [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (2,985,133) (2,700,341)
Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member] | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 0 5
Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member] | Not Designated as Hedging Instrument [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 16 26
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets (53,591) 5,422
Fair Value, Inputs, Level 3 [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Total (8,181) (8,181)
Fair Value, Inputs, Level 3 [Member] | Put Option [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts $ (8,181) $ (8,181)