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Financial Instruments | 9 Months Ended
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Sep. 30, 2018
Financial Instruments (Thousands of Dollars) [Abstract] |
Financial Instruments | (6) Financial Instruments The Company's financial instruments include cash and cash equivalents, accounts receivable, short-term borrowings, accounts payable and certain accrued liabilities. At September 30, 2018, October 1, 2017 and December 31, 2017, the carrying cost of these instruments approximated their fair value. The Company's financial instruments at September 30, 2018, October 1, 2017 and December 31, 2017 also include certain assets and liabilities mea sured at fair value (see Notes 8 an d 10) as well as long-term borrowings. The carrying costs, which are equal to the outstanding principal amounts, and fair values of the Company's long-term borrowings as of September 30, 2018, October 1, 2017 and December 31, 2017 are as follows:
| 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
The fair values of the Company's long-term debt are considered Level 3 fair values (see Note 8 for further discussion of the fair value hierarchy) and are measured using the discounted future cash flows method. In addition to the debt terms, the valuation methodology includes an assumption of a discount rate that approximates the current yield on a similar debt security. This assumption is considered an unobservable input in that it reflects the Company's own assumptions about the inputs that market participants would use in pricing the asset or liability. The Company believes that this is the best information available for use in the fair value measurement.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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