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SENIOR NOTES PAYABLE AND OTHER DEBT - Summary of Senior Notes Payables and Other Debt (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Aug. 31, 2018
Jul. 31, 2018
Feb. 28, 2018
Dec. 31, 2017
Debt instruments          
Document Period End Date Sep. 30, 2018        
Senior notes payable and other debt, gross $ 10,584,000       $ 11,365,633
Deferred financing costs, net (77,091)       (73,093)
Unamortized fair value adjustment (2,207)       12,139
Unamortized discounts (26,247)       (28,617)
Senior notes payable and other debt 10,478,455       11,276,062
Unsecured Revolving Credit Facility          
Debt instruments          
Senior notes payable and other debt, gross 514,353       535,832
Unsecured Revolving Credit Facility | Borrowings Originally Denominated in CAD          
Debt instruments          
Senior notes payable and other debt, gross 21,300       28,700
Unsecured Revolving Credit Facility | Borrowings Originally Denominated in GBP          
Debt instruments          
Senior notes payable and other debt, gross 28,500       31,100
Secured Revolving Construction Credit Facility due 2022          
Debt instruments          
Senior notes payable and other debt, gross $ 63,806       2,868
2.00% Senior Notes due 2018          
Debt instruments          
Interest rate 2.00%     2.00%  
Senior notes payable and other debt, gross $ 0       700,000
4.00% Senior Notes due 2019          
Debt instruments          
Interest rate 4.00%        
Senior notes payable and other debt, gross $ 0       600,000
3.00% Senior Notes, Series A due 2019          
Debt instruments          
Interest rate 3.00%        
Senior notes payable and other debt, gross $ 309,981       318,041
2.70% Senior Notes due 2020          
Debt instruments          
Interest rate 2.70%        
Senior notes payable and other debt, gross $ 500,000       500,000
Unsecured term loan due 2020          
Debt instruments          
Senior notes payable and other debt, gross $ 0       900,000
4.75% Senior Notes due 2021          
Debt instruments          
Interest rate 4.75%        
Senior notes payable and other debt, gross $ 0       700,000
4.25% Senior Notes due 2022          
Debt instruments          
Interest rate 4.25%        
Senior notes payable and other debt, gross $ 600,000       600,000
3.25% Senior Notes due 2022          
Debt instruments          
Interest rate 3.25%        
Senior notes payable and other debt, gross $ 500,000       500,000
3.30% Senior Notes, Series C due 2022          
Debt instruments          
Interest rate 3.30%        
Senior notes payable and other debt, gross $ 193,738       198,776
Unsecured Term Loan Due 2023          
Debt instruments          
Senior notes payable and other debt, gross $ 300,000   $ 300,000   0
3.125% Senior Notes due 2023          
Debt instruments          
Interest rate 3.125%        
Senior notes payable and other debt, gross $ 400,000       400,000
3.10% Senior Notes due 2023          
Debt instruments          
Interest rate 3.10%        
Senior notes payable and other debt, gross $ 400,000       400,000
2.55% Senior Notes, Series D due 2023          
Debt instruments          
Interest rate 2.55%        
Senior notes payable and other debt, gross $ 213,112       218,653
Unsecured Term Loan Due 2024          
Debt instruments          
Senior notes payable and other debt, gross $ 600,000   $ 600,000   0
3.75% Senior Notes due 2024          
Debt instruments          
Interest rate 3.75%        
Senior notes payable and other debt, gross $ 400,000       400,000
4.125% Senior Notes, Series B due 2024          
Debt instruments          
Interest rate 4.125%        
Senior notes payable and other debt, gross $ 193,738       198,776
3.50% Senior Notes due 2025          
Debt instruments          
Interest rate 3.50%        
Senior notes payable and other debt, gross $ 600,000       600,000
4.125% Senior Notes due 2026          
Debt instruments          
Interest rate 4.125%        
Senior notes payable and other debt, gross $ 500,000       500,000
3.25% Senior Notes due 2026          
Debt instruments          
Interest rate 3.25%        
Senior notes payable and other debt, gross $ 450,000       450,000
3.85% Senior Notes Due 2027          
Debt instruments          
Interest rate 3.85%        
Senior notes payable and other debt, gross $ 400,000       400,000
4.00% Senior Notes due 2028          
Debt instruments          
Interest rate 4.00%     4.00%  
Senior notes payable and other debt, gross $ 650,000     $ 650,000 0
4.40% Senior Notes due 2029          
Debt instruments          
Interest rate 4.40% 4.40%      
Senior notes payable and other debt, gross $ 750,000 $ 750,000     0
6.90% Senior Notes due 2037          
Debt instruments          
Interest rate 6.90%        
Senior notes payable and other debt, gross $ 52,400       52,400
6.59% Senior Notes due 2038          
Debt instruments          
Interest rate 6.59%        
Senior notes payable and other debt, gross $ 22,823       22,973
5.45% Senior Notes due 2043          
Debt instruments          
Interest rate 5.45%        
Senior notes payable and other debt, gross $ 258,750       258,750
5.70% Senior Notes due 2043          
Debt instruments          
Interest rate 5.70%        
Senior notes payable and other debt, gross $ 300,000       300,000
4.375% Senior Notes due 2045          
Debt instruments          
Interest rate 4.375%        
Senior notes payable and other debt, gross $ 300,000       300,000
Mortgages Loans and Other          
Debt instruments          
Senior notes payable and other debt, gross $ 1,111,299       $ 1,308,564