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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2020
Defined Benefit Plan [Abstract] |
Components of net periodic benefit cost for retirement and other postretirement benefit plans | The following table sets forth the components of net periodic benefit cost for our retirement and other postretirement benefit plans for the periods indicated:
| Retirement Benefits |  | Other Postretirement Benefits
| Three Months Ended |  | Three Months Ended
| March 31, |  | March 31,
| 2020 |  | 2019 |  | 2020 |  | 2019
| (Thousands of dollars)
Components of net periodic benefit cost |  |  |  |  |  |  |  |
Service cost | $ | 2,036 |  |  | $ | 1,954 |  |  | $ | 115 |  |  | $ | 117 |
Interest cost | 4,574 |  |  | 5,126 |  |  | 442 |  |  | 509 |
Expected return on plan assets | (6,232 | ) |  | (5,892 | ) |  | (722 | ) |  | (570 | )
Amortization of prior service cost (credit) (a) | 28 |  |  | — |  |  | — |  |  | (57 | )
Amortization of net loss (a) | 4,571 |  |  | 3,158 |  |  | 1 |  |  | 74 |
Net periodic benefit cost (income) | $ | 4,977 |  |  | $ | 4,346 |  |  | $ | (164 | ) |  | $ | 73 |
(a) - These components of net periodic benefit cost are recognized in accumulated other comprehensive loss and are reclassified to other income (expense) in our Consolidated Statements of Income, with related income tax benefits of $1.1 million and $0.7 million reclassified to income tax (expense) benefit for the three months ended March 31, 2020 and 2019, respectively.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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