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Fair Value (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Financial Instruments Measured/Discussed at Fair Value        
Hedging losses reclassified from accumulated other comprehensive income into earnings $ 1,427 $ 1,438 $ 2,992 $ 3,011
Recurring basis | Fair Value, Inputs, Level 1 [Member]        
Financial Instruments Measured/Discussed at Fair Value        
DownREIT units (1,199)   (1,199)  
Total (3,354,208)   (3,354,208)  
Recurring basis | Fair Value, Inputs, Level 2 [Member]        
Financial Instruments Measured/Discussed at Fair Value        
Total (3,022,105)   (3,022,105)  
Recurring basis | Fair Value, Inputs, Level 3 [Member]        
Financial Instruments Measured/Discussed at Fair Value        
Total (8,954)   (8,954)  
Recurring basis | Fair Value, Inputs, Level 3 [Member] | Puts        
Financial Instruments Measured/Discussed at Fair Value        
Fair value of remaining outstanding Puts (8,954)   (8,954)  
Cash Flow Hedges | Recurring basis | Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member]        
Financial Instruments Measured/Discussed at Fair Value        
Derivative assets 17   17  
Unsecured notes | Recurring basis | Fair Value, Inputs, Level 1 [Member]        
Financial Instruments Measured/Discussed at Fair Value        
Indebtedness (3,353,009)   (3,353,009)  
Secured Debt and Variable Rate Unsecured Term Loan [Member] | Recurring basis | Fair Value, Inputs, Level 2 [Member]        
Financial Instruments Measured/Discussed at Fair Value        
Indebtedness (3,022,147)   (3,022,147)  
Not Designated as Hedging Instrument [Member] | Recurring basis | Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member]        
Financial Instruments Measured/Discussed at Fair Value        
Derivative assets 25   25  
Estimate of Fair Value Measurement [Member] | Recurring basis        
Financial Instruments Measured/Discussed at Fair Value        
DownREIT units (1,199)   (1,199)  
Total (6,385,267)   (6,385,267)  
Estimate of Fair Value Measurement [Member] | Recurring basis | Puts        
Financial Instruments Measured/Discussed at Fair Value        
Fair value of remaining outstanding Puts (8,954)   (8,954)  
Estimate of Fair Value Measurement [Member] | Cash Flow Hedges | Recurring basis | Interest Rate Cap [Member]        
Financial Instruments Measured/Discussed at Fair Value        
Derivative assets 17   17  
Estimate of Fair Value Measurement [Member] | Unsecured notes | Recurring basis        
Financial Instruments Measured/Discussed at Fair Value        
Indebtedness (3,353,009)   (3,353,009)  
Estimate of Fair Value Measurement [Member] | Secured Debt and Variable Rate Unsecured Term Loan [Member] | Recurring basis        
Financial Instruments Measured/Discussed at Fair Value        
Indebtedness (3,022,147)   (3,022,147)  
Estimate of Fair Value Measurement [Member] | Not Designated as Hedging Instrument [Member] | Recurring basis | Interest Rate Cap [Member]        
Financial Instruments Measured/Discussed at Fair Value        
Derivative assets $ 25   $ 25