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Borrowings (Indebtedness) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total outstanding debt $ 3,427,568 $ 3,512,700
Average interest rate (percentage) 3.70% 3.70%
Contract maturity Dec. 22, 2020  
Secured Debt [Member]    
Debt Instrument [Line Items]    
Average interest rate (percentage) 3.50%  
Contract maturity Feb. 25, 2019  
Unsecured Debt    
Debt Instrument [Line Items]    
Total outstanding debt $ 2,141,332  
Average interest rate (percentage) 3.80%  
Contract maturity Jan. 26, 2022  
FNMA | Secured Debt [Member]    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 240,000  
Debt Instrument, Basis Spread on Variable Rate 0.17%  
Term Loan [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 550,000  
Average interest rate (percentage) 3.10%  
Contract maturity Nov. 10, 2017  
Fixed Rate Debt    
Debt Instrument [Line Items]    
Total outstanding debt $ 3,148,100 $ 3,074,700
Fixed Rate Debt | Secured Debt [Member]    
Debt Instrument [Line Items]    
Total outstanding debt $ 1,062,862  
Average interest rate (percentage) 3.90%  
Contract maturity Jun. 02, 2019  
Fixed Rate Debt | Unsecured Debt    
Debt Instrument [Line Items]    
Total outstanding debt $ 1,535,200 1,320,200
Variable Rate Debt    
Debt Instrument [Line Items]    
Total outstanding debt 265,000 397,900
Variable Rate Debt | Secured Debt [Member]    
Debt Instrument [Line Items]    
Total outstanding debt [1] $ 190,000  
Average interest rate (percentage) 0.80%  
Contract maturity Aug. 26, 2017  
Variable Rate Debt | Unsecured Debt    
Debt Instrument [Line Items]    
Total outstanding debt [2] $ 75,000 59,000
Fair Market Value Adjustment and Debt Issuance Cost [Member]    
Debt Instrument [Line Items]    
Total outstanding debt 14,500 $ 40,100
$750 million unsecured revolving credit facility [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 75,000  
Average interest rate (percentage) 1.23%  
Secured Debt [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Total outstanding debt $ 1,286,236  
Variable Rate Credit Facility [Member] | FNMA | Secured Debt [Member]    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 190,000  
Average interest rate (percentage) 0.80%  
Contract maturity Aug. 26, 2017  
Fixed Rate Debt | Mortgages | Secured Debt [Member]    
Debt Instrument [Line Items]    
Mortgage Loans on Real Estate $ 1,012,862  
Average interest rate (percentage) 3.90%  
Contract maturity Jul. 12, 2019  
Fixed Rate Debt | FNMA | Secured Debt [Member]    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 50,000  
Average interest rate (percentage) 4.70%  
Contract maturity Mar. 31, 2017  
Fixed Rate Debt | Senior Notes | Unsecured Debt    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 1,535,246  
Average interest rate (percentage) 4.20%  
Contract maturity Sep. 16, 2023  
Freddie Mac | Mortgages | Secured Debt [Member]    
Debt Instrument [Line Items]    
Loss on debt extinguishment $ 200  
Freddie Mac | FNMA | Secured Debt [Member]    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 190,000  
Average interest rate (percentage) 0.80%  
Freddie Mac | $500 million unsecured revolving credit faciltiy [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 75,000  
Average interest rate (percentage) 1.20%  
Contract maturity Apr. 15, 2020  
Fair Market Value Adjustment and Debt Issuance Cost [Member] | $750 million unsecured revolving credit facility [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 33,374  
Debt Instrument, Face Amount $ (18,914)  
Contract maturity Mar. 13, 2019  
Interest Rate Cap | FNMA | Secured Debt [Member]    
Debt Instrument [Line Items]    
Derivative, Notional Amount $ 125,000  
Minimum | $750 million unsecured revolving credit facility [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.85%  
Maximum | $750 million unsecured revolving credit facility [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.55%  
Farmington Village [Member] | Freddie Mac | Mortgages | Secured Debt [Member]    
Debt Instrument [Line Items]    
Repayments of Debt $ 15,200  
Reserve at Woodwind Lakes | Freddie Mac | Mortgages | Secured Debt [Member]    
Debt Instrument [Line Items]    
Repayments of Debt 10,100  
Colonial Village at Timber Crest [Member] | Freddie Mac | Mortgages | Secured Debt [Member]    
Debt Instrument [Line Items]    
Repayments of Debt 11,600  
Sanctuary At Oglethorpe [Member] | Freddie Mac | Mortgages | Secured Debt [Member]    
Debt Instrument [Line Items]    
Repayments of Debt 23,500  
Colonial Grand at Wilmington [Member] | Freddie Mac | Mortgages | Secured Debt [Member]    
Debt Instrument [Line Items]    
Repayments of Debt $ 25,500  
[1] Includes capped balances
[2] Amounts are adjusted to reflect interest rate swap and cap agreements in effect at December 31, 2015, and 2014, respectively, which results in the Company paying fixed interest payments over the terms of the interest rate swaps and on changes in interest rates above the strike rate of the cap.