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Fair Value (Details 2) - Recurring basis - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Inputs, Level 1 [Member]    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units $ (1,353) $ (1,381)
Total (4,275,075) (3,669,798)
Fair Value, Inputs, Level 2 [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Total (2,787,261) (2,694,888)
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)
Cash Flow Hedges | Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 0 5
Unsecured notes | Fair Value, Inputs, Level 1 [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (4,273,722) (3,668,417)
Secured Debt and Variable Rate Unsecured Term Loan [Member] | Fair Value, Inputs, Level 2 [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (2,732,990) (2,700,341)
Not Designated as Hedging Instrument [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 40 26
Estimate of Fair Value Measurement [Member]    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units (1,353) (1,381)
Total (7,070,517) (6,372,867)
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)
Estimate of Fair Value Measurement [Member] | Cash Flow Hedges | Interest Rate Cap [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 0 5
Estimate of Fair Value Measurement [Member] | Cash Flow Hedges | Interest Rate Swap [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets (54,311) 5,422
Estimate of Fair Value Measurement [Member] | Cash Flow Hedges | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets (54,311) 5,422
Estimate of Fair Value Measurement [Member] | Unsecured notes    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (4,273,722) (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 (2,732,990) (2,700,341)
Estimate of Fair Value Measurement [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Cap [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets $ 40 $ 26