Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total long-term Debt	$ 1,819,588	$ 1,705,210
Current portion of long-term debt	425,684	307,294
Long-term debt	1,393,904	1,397,916
Senior Notes \| 1.875% Senior Notes
Debt Instrument [Line Items]
Total long-term Debt	440,098	444,155
Senior Notes \| 4.15% Senior Notes
Debt Instrument [Line Items]
Total long-term Debt	422,238	422,116
Senior Notes \| 4.50% Senior Notes
Debt Instrument [Line Items]
Total long-term Debt	174,701	174,626
Senior Notes \| 5.45% Senior Notes
Debt Instrument [Line Items]
Total long-term Debt	346,034	345,996
Commercial paper notes
Debt Instrument [Line Items]
Total long-term Debt	425,000	306,606
Variable-rate foreign bank loans
Debt Instrument [Line Items]
Total long-term Debt	7,232	7,216
Finance lease obligations
Debt Instrument [Line Items]
Total long-term Debt	$ 4,285	$ 4,495

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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