Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total long-term debt	$ 1,712,886	$ 2,369,262
Current portion of long-term debt	314,500	247,544
Long-term debt	1,398,386	2,121,718
Senior Notes \| 1.875% Senior Notes
Debt Instrument [Line Items]
Total long-term debt	418,471	719,617
Senior Notes \| 3.00% Senior Notes
Debt Instrument [Line Items]
Total long-term debt	0	248,714
Senior Notes \| 4.15% Senior Notes
Debt Instrument [Line Items]
Total long-term debt	421,262	421,141
Senior Notes \| 4.50% Senior Notes
Debt Instrument [Line Items]
Total long-term debt	174,098	347,620
Senior Notes \| 5.45% Senior Notes
Debt Instrument [Line Items]
Total long-term debt	345,726	345,687
Commercial Paper
Debt Instrument [Line Items]
Total long-term debt	314,500	247,503
Variable-rate foreign bank loans
Debt Instrument [Line Items]
Total long-term debt	38,829	38,939
Other long-term debt
Debt Instrument [Line Items]
Total long-term debt	$ 0	$ 41

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
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