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OTHER INCOME AND OTHER EXPENSE (Tables) | 6 Months Ended
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Jun. 30, 2018
Other Income and Other Expense Disclosure | The following table sets forth the components of other income and other expense for the periods indicated:
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
|  | (Thousands of dollars)
Net periodic benefit cost other than service cost |  | $ | (2,403 | ) |  | $ | (4,313 | ) |  | $ | (4,137 | ) |  | $ | (8,626 | )
Other, net |  | 209 |  |  | 413 |  |  | (221 | ) |  | 1,319 |
Total other income (expense), net |  | $ | (2,194 | ) |  | $ | (3,900 | ) |  | $ | (4,358 | ) |  | $ | (7,307 | )

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- Definition The entire disclosure for other income or other expense items (both operating and nonoperating). Sources of nonoperating income or nonoperating expense that may be disclosed, include amounts earned from dividends, interest on securities, profits (losses) on securities, net and miscellaneous other income or income deductions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -URI http://asc.fasb.org/topic&trid=2122503 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 610 -URI http://asc.fasb.org/topic&trid=49130413 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration