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Fair Value (Details 3) - Recurring basis - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Estimate of Fair Value Measurement [Member]    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units $ (1,377) $ (1,329)
Total (6,962,494) (6,955,564)
Estimate of Fair Value Measurement [Member] | Unsecured notes    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (4,226,278) (4,218,627)
Estimate of Fair Value Measurement [Member] | Secured Debt and Variable Rate Unsecured Term Loan [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (2,743,794) (2,744,462)
Estimate of Fair Value Measurement [Member] | Interest Rate Cap [Member] | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets   2
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 30 79
Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member] | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 14,955 14,775
Derivative Liability (102)  
Estimate of Fair Value Measurement [Member] | Put Option [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts (5,928) (6,002)
Fair Value, Inputs, Level 1 [Member]    
Financial Instruments Measured/Discussed at Fair Value    
DownREIT units (1,377) (1,329)
Total (4,227,655) (4,219,956)
Fair Value, Inputs, Level 1 [Member] | Unsecured notes    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (4,226,278) (4,218,627)
Fair Value, Inputs, Level 2 [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Total (2,728,911) (2,729,606)
Fair Value, Inputs, Level 2 [Member] | Secured Debt and Variable Rate Unsecured Term Loan [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Indebtedness (2,743,794) (2,744,462)
Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member] | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets   2
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 30 79
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | Cash Flow Hedges    
Financial Instruments Measured/Discussed at Fair Value    
Derivative assets 14,955 14,775
Derivative Liability (102)  
Fair Value, Inputs, Level 3 [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Total (5,928) (6,002)
Fair Value, Inputs, Level 3 [Member] | Put Option [Member]    
Financial Instruments Measured/Discussed at Fair Value    
Fair value of remaining outstanding Puts $ (5,928) $ (6,002)