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Long-Term Debt Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total long-term debt $ 3,050,257 $ 1,705,210
Current portion of long-term debt 187,336 307,294
Long-term debt 2,862,921 1,397,916
1.125% Notes    
Debt Instrument [Line Items]    
Unamortized discount and debt issuance costs 5,659 0
1.625% Notes    
Debt Instrument [Line Items]    
Unamortized discount and debt issuance costs 5,696 0
1.875% Senior Notes    
Debt Instrument [Line Items]    
Unamortized discount and debt issuance costs 1,831 2,841
3.45% Senior Notes    
Debt Instrument [Line Items]    
Unamortized discount and debt issuance costs 3,533 0
4.15% Senior Notes    
Debt Instrument [Line Items]    
Unamortized discount and debt issuance costs 2,398 2,884
4.50% Senior Notes    
Debt Instrument [Line Items]    
Unamortized discount and debt issuance costs 0 589
5.45% Senior Notes    
Debt Instrument [Line Items]    
Unamortized discount and debt issuance costs 3,850 4,004
Unsecured Debt | 1.125% Notes    
Debt Instrument [Line Items]    
Total long-term debt 549,241 0
Unsecured Debt | 1.625% Notes    
Debt Instrument [Line Items]    
Total long-term debt 549,204 0
Unsecured Debt | Floating Rate Notes    
Debt Instrument [Line Items]    
Total long-term debt 198,831 0
Senior Notes | 1.875% Senior Notes    
Debt Instrument [Line Items]    
Total long-term debt 434,241 444,155
Senior Notes | 3.45% Senior Notes    
Debt Instrument [Line Items]    
Total long-term debt 296,467 0
Senior Notes | 4.15% Senior Notes    
Debt Instrument [Line Items]    
Total long-term debt 422,603 422,116
Senior Notes | 4.50% Senior Notes    
Debt Instrument [Line Items]    
Total long-term debt 0 174,626
Senior Notes | 5.45% Senior Notes    
Debt Instrument [Line Items]    
Total long-term debt 346,150 345,996
Commercial Paper    
Debt Instrument [Line Items]    
Total long-term debt 186,700 306,606
Variable-rate foreign bank loans    
Debt Instrument [Line Items]    
Total long-term debt 7,296 7,216
Finance lease obligations    
Debt Instrument [Line Items]    
Total long-term debt $ 59,524 $ 4,495