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Fair Value of Instruments (Estimated Fair Value and Carrying Amounts) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Global revolving credit facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred financing costs $ 7,200 $ 10,900
Unsecured term loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred financing costs 4,800 6,100
Unsecured senior notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of long-term debt 18,500 15,600
Deferred financing costs $ 37,800 25,400
Unsecured senior notes | 5.875% notes due 2020    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate 5.875%  
Unsecured senior notes | 3.400% notes due 2020    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate 3.40%  
Unsecured senior notes | 3.950% notes due 2022    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate 3.95%  
Unsecured senior notes | 3.625% notes due 2022    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate 3.625%  
Unsecured senior notes | 4.750% notes due 2023    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate 4.75%  
Unsecured senior notes | 2.750% notes due 2023    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate 2.75%  
Unsecured senior notes | 2.625% notes due 2024    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate 2.625%  
Unsecured senior notes | 2.750% notes due 2024    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate 2.75%  
Unsecured senior notes | 4.750% notes due 2025    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate 4.75%  
Unsecured senior notes | 4.250% notes due 2025    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate 4.25%  
Mortgage loans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred financing costs $ 0 0
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of long-term debt 9,066,434 6,129,866
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of long-term debt 8,698,464 5,880,996
Level 2 | Estimated Fair Value | Global revolving credit facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Lines of credit 558,191 210,077
Level 2 | Estimated Fair Value | Unsecured term loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Lines of credit 1,425,117 1,488,498
Level 2 | Estimated Fair Value | Unsecured senior notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Exchangeable senior debentures 6,976,603 4,428,074
Level 2 | Estimated Fair Value | Mortgage loans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage Loans 106,523 3,217
Level 2 | Carrying Value | Global revolving credit facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Lines of credit 558,191 210,077
Level 2 | Carrying Value | Unsecured term loan    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Lines of credit 1,425,117 1,488,498
Level 2 | Carrying Value | Unsecured senior notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Exchangeable senior debentures 6,608,545 4,179,171
Level 2 | Carrying Value | Mortgage loans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage Loans $ 106,611 $ 3,250