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Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2018
Financial Instruments (Thousands of Dollars) [Abstract] |
Schedule of Long-term Debt Instruments |
| September 30, 2018 |  | October 1, 2017 |  | December 31, 2017
| Carrying |  | Fair |  | Carrying |  | Fair |  | Carrying |  | Fair
| Cost |  | Value |  | Cost |  | Value |  | Cost |  | Value
6.35% Notes Due 2040 | $ | 500,000 |  |  | 546,450 |  |  | 500,000 |  |  | 613,750 |  |  | 500,000 |  |  | 601,800
3.50% Notes Due 2027 |  | 500,000 |  |  | 466,350 |  |  | 500,000 |  |  | 496,850 |  |  | 500,000 |  |  | 488,300
5.10% Notes Due 2044 |  | 300,000 |  |  | 285,390 |  |  | 300,000 |  |  | 324,300 |  |  | 300,000 |  |  | 313,320
3.15% Notes Due 2021 |  | 300,000 |  |  | 297,720 |  |  | 300,000 |  |  | 306,840 |  |  | 300,000 |  |  | 302,640
6.60% Debentures Due 2028 |  | 109,895 |  |  | 124,698 |  |  | 109,895 |  |  | 132,830 |  |  | 109,895 |  |  | 131,390
Total long-term debt | $ | 1,709,895 |  |  | 1,720,608 |  |  | 1,709,895 |  |  | 1,874,570 |  |  | 1,709,895 |  |  | 1,837,450
Less: Deferred debt expenses |  | 15,174 |  |  | - |  |  | 16,634 |  |  | - |  |  | 16,286 |  |  | -
Long-term debt | $ | 1,694,721 |  |  | 1,720,608 |  |  | 1,693,261 |  |  | 1,874,570 |  |  | 1,693,609 |  |  | 1,837,450

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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