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EMPLOYEE BENEFITS (Tables) | 9 Months Ended
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Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Schedule of Net Periodic Benefit Costs Charged to Operating Expenses | The net periodic benefits for the Company's postretirement healthcare benefits plan, which are valued at the measurement date of January 1 for each year and recognized evenly throughout the year, consisted of the following (in thousands of dollars):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Selling, general and administrative expenses |  |  |  |  |  |  |
Service cost | $ | 1,629 |  |  | $ | 1,856 |  |  | $ | 4,887 |  |  | $ | 5,649 |
Other income (expense) |  |  |  |  |  |  |
Interest cost | 1,712 |  |  | 2,026 |  |  | 5,136 |  |  | 6,323 |
Expected return on assets | (3,315 | ) |  | (2,957 | ) |  | (9,945 | ) |  | (8,670 | )
Amortization of unrecognized gains | (840 | ) |  | (609 | ) |  | (2,520 | ) |  | (1,919 | )
Amortization of prior service credits | (2,424 | ) |  | (1,893 | ) |  | (7,272 | ) |  | (5,139 | )
Net periodic benefit | $ | (3,238 | ) |  | $ | (1,577 | ) |  | $ | (9,714 | ) |  | $ | (3,756 | )

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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