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Fair Value (Details 4) - Recurring basis - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Estimate of Fair Value Measurement    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units $ (1,338) $ (1,329)
Total (7,106,683) (6,955,564)
Estimate of Fair Value Measurement | Unsecured notes    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (4,999,985) (4,218,627)
Estimate of Fair Value Measurement | Secured Debt and Variable Rate Unsecured Term Loan    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (2,098,870) (2,744,462)
Estimate of Fair Value Measurement | Interest Rate Cap | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets   2
Estimate of Fair Value Measurement | Interest Rate Cap | Not Designated as Hedging Instrument    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 14 79
Estimate of Fair Value Measurement | Interest Rate Swap | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 1,422 14,775
Derivative liability (1,998)  
Estimate of Fair Value Measurement | Put Option    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts (5,928) (6,002)
Fair Value, Inputs, Level 1    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units (1,338) (1,329)
Total (5,001,323) (4,219,956)
Fair Value, Inputs, Level 1 | Unsecured notes    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (4,999,985) (4,218,627)
Fair Value, Inputs, Level 2    
Financial Instruments Measured/Discussed at Fair Value    
Total (2,099,432) (2,729,606)
Fair Value, Inputs, Level 2 | Secured Debt and Variable Rate Unsecured Term Loan    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (2,098,870) (2,744,462)
Fair Value, Inputs, Level 2 | Interest Rate Cap | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets   2
Fair Value, Inputs, Level 2 | Interest Rate Cap | Not Designated as Hedging Instrument    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 14 79
Fair Value, Inputs, Level 2 | Interest Rate Swap | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 1,422 14,775
Derivative liability (1,998)  
Fair Value, Inputs, Level 3    
Financial Instruments Measured/Discussed at Fair Value    
Total (5,928) (6,002)
Fair Value, Inputs, Level 3 | Put Option    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts $ (5,928) $ (6,002)