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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Notes) | 9 Months Ended
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Sep. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE 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
| September 30, |  | September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
| (Thousands of dollars)
Components of net periodic benefit cost (income) |  |  |  |  |  |  |
Service cost | $ | 2,076 |  |  | $ | 2,036 |  |  | $ | 105 |  |  | $ | 115 |
Interest cost | 4,220 |  |  | 4,574 |  |  | 363 |  |  | 442 |
Expected return on plan assets | (6,269) |  |  | (6,232) |  |  | (340) |  |  | (722) |
Amortization of prior service cost (a) | 28 |  |  | 28 |  |  | — |  |  | — |
Amortization of net loss (a) | 4,913 |  |  | 4,571 |  |  | 921 |  |  | 1 |
Net periodic benefit cost (income) | $ | 4,968 |  |  | $ | 4,977 |  |  | $ | 1,049 |  |  | $ | (164) |
(a) - These components of net periodic benefit cost (income) are recognized in accumulated other comprehensive loss and are reclassified to other expense in our Consolidated Statements of Income, with related income tax benefits of $1.3 million and $1.1 million reclassified to income taxes for the three months ended September 30, 2021 and 2020, respectively.
| Retirement Benefits |  | Other Postretirement Benefits
| Nine Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
| (Thousands of dollars)
Components of net periodic benefit cost (income) |  |  |  |  |  |  |
Service cost | $ | 6,228 |  |  | $ | 6,108 |  |  | $ | 315 |  |  | $ | 345 |
Interest cost | 12,660 |  |  | 13,722 |  |  | 1,089 |  |  | 1,326 |
Expected return on plan assets | (18,807) |  |  | (18,696) |  |  | (1,020) |  |  | (2,166) |
Amortization of prior service cost (a) | 84 |  |  | 84 |  |  | — |  |  | — |
Amortization of net loss (a) | 14,739 |  |  | 13,713 |  |  | 2,763 |  |  | 3 |
Net periodic benefit cost (income) | $ | 14,904 |  |  | $ | 14,931 |  |  | $ | 3,147 |  |  | $ | (492) |
(a) - These components of net periodic benefit cost (income) are recognized in accumulated other comprehensive loss and are reclassified to other expense in our Consolidated Statements of Income, with related income tax benefits of $4.0 million and $3.2 million reclassified to income taxes for the nine months ended September 30, 2021 and 2020, respectively.

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