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Borrowings (Indebtedness) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total outstanding debt $ 4,499,712 $ 3,427,600
Average interest rate (percentage) 3.50% 3.70%
Contract maturity Nov. 08, 2020  
Secured Debt [Member]    
Debt Instrument [Line Items]    
Average interest rate (percentage) 3.50%  
Contract maturity Jun. 16, 2019  
Unsecured Debt    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 2,700,000  
Total outstanding debt $ 3,180,624  
Average interest rate (percentage) 3.40%  
Contract maturity Jun. 07, 2021  
Mortgages    
Debt Instrument [Line Items]    
Average interest rate (percentage) 5.99%  
FNMA | Secured Debt [Member]    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 160,000  
Term Loan [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 850,000  
Average interest rate (percentage) 3.10%  
Contract maturity Nov. 10, 2017  
Senior Notes | Unsecured Debt    
Debt Instrument [Line Items]    
Average interest rate (percentage) 3.70%  
Fixed Rate Debt    
Debt Instrument [Line Items]    
Total outstanding debt $ 3,838,300 $ 3,148,100
Fixed Rate Debt | Secured Debt [Member]    
Debt Instrument [Line Items]    
Total outstanding debt $ 1,128,284  
Average interest rate (percentage) 3.90%  
Contract maturity Aug. 11, 2019  
Fixed Rate Debt | Unsecured Debt    
Debt Instrument [Line Items]    
Total outstanding debt $ 1,860,000 1,535,200
Variable Rate Debt    
Debt Instrument [Line Items]    
Total outstanding debt 650,000 265,000
Variable Rate Debt | Secured Debt [Member]    
Debt Instrument [Line Items]    
Total outstanding debt [1] $ 160,000  
Average interest rate (percentage) 1.10%  
Contract maturity Jun. 01, 2018  
Variable Rate Debt | Unsecured Debt    
Debt Instrument [Line Items]    
Total outstanding debt [2] $ 490,000 75,000
Fair Market Value Adjustment and Debt Issuance Cost [Member]    
Debt Instrument [Line Items]    
Total outstanding debt 11,400 $ 14,500
$750 million unsecured revolving credit facility [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 490,000  
Average interest rate (percentage) 1.64%  
Secured Debt [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Total outstanding debt $ 1,319,088  
Variable Rate Credit Facility [Member] | FNMA | Secured Debt [Member]    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 160,000  
Average interest rate (percentage) 1.10%  
Contract maturity Jun. 01, 2018  
Fixed Rate Debt | Mortgages | Secured Debt [Member]    
Debt Instrument [Line Items]    
Mortgage Loans on Real Estate $ 1,128,284  
Average interest rate (percentage) 3.90%  
Contract maturity Aug. 11, 2019  
Fixed Rate Debt | Senior Notes | Unsecured Debt    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 1,860,000  
Average interest rate (percentage) 4.10%  
Contract maturity May 29, 2023  
Freddie Mac | FNMA | Secured Debt [Member]    
Debt Instrument [Line Items]    
Average interest rate (percentage) 1.10%  
Freddie Mac | $500 million unsecured revolving credit faciltiy [Member] | Unsecured Debt    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 490,000  
Average interest rate (percentage) 1.60%  
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 $ 30,804  
Debt Instrument, Face Amount $ (19,376)  
Contract maturity  
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%  
[1] Includes capped balances
[2] Amounts are adjusted to reflect interest rate swap and cap agreements in effect at December 31, 2016, and 2015, respectively, which results in us 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.