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Financial Instruments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2019
Financial Instruments (Thousands of Dollars) [Abstract] |
Schedule of Long-term Debt Instruments |
| March 31, 2019 |  | April 1, 2018 |  | December 30, 2018
| Carrying |  | Fair |  | Carrying |  | Fair |  | Carrying |  | Fair
| Cost |  | Value |  | Cost |  | Value |  | Cost |  | Value
6.35% Notes Due 2040 | $ | 500,000 |  |  | 548,200 |  |  | 500,000 |  |  | 585,400 |  |  | 500,000 |  |  | 535,000
3.50% Notes Due 2027 |  | 500,000 |  |  | 479,450 |  |  | 500,000 |  |  | 468,000 |  |  | 500,000 |  |  | 457,350
5.10% Notes Due 2044 |  | 300,000 |  |  | 285,990 |  |  | 300,000 |  |  | 299,460 |  |  | 300,000 |  |  | 272,640
3.15% Notes Due 2021 |  | 300,000 |  |  | 301,440 |  |  | 300,000 |  |  | 300,480 |  |  | 300,000 |  |  | 297,600
6.60% Debentures Due 2028 |  | 109,895 |  |  | 129,445 |  |  | 109,895 |  |  | 128,006 |  |  | 109,895 |  |  | 123,346
Total long-term debt | $ | 1,709,895 |  |  | 1,744,525 |  |  | 1,709,895 |  |  | 1,781,346 |  |  | 1,709,895 |  |  | 1,685,936
Less: Deferred debt expenses |  | 14,433 |  |  | - |  |  | 15,918 |  |  | - |  |  | 14,803 |  |  | -
Long-term debt | $ | 1,695,462 |  |  | 1,744,525 |  |  | 1,693,977 |  |  | 1,781,346 |  |  | 1,695,092 |  |  | 1,685,936

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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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