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EMPLOYEE BENEFITS | 9 Months Ended
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Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
EMPLOYEE BENEFITS | EMPLOYEE BENEFITS The Company has a postretirement healthcare benefits plan that provides coverage for a majority of its U.S. employees hired prior to January 1, 2013. Effective January 1, 2018, the Company implemented plan design changes, which moved all post-65 Medicare eligible retirees to healthcare exchanges and provides them a subsidy, based on years of service, to purchase insurance. 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 | )
The Company has established a Group Benefit Trust (Trust) to fund postretirement healthcare plan obligations and process benefit payments. The Company has no minimum funding requirement and did not make a contribution to the Trust during the nine months ended September 30, 2018.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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