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Employee and Retiree Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Expense | The table that follows provides the components of net periodic benefit expense for the three-month and six-month periods ended June 30, 2021 and 2020.
| Three Months Ended June 30,
| Pension Benefits |  | Other Postretirement Benefits
(Thousands of dollars) | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 1,768 |  |  | 2,166 |  |  | 327 |  |  | 446 |
Interest cost | 4,300 |  |  | 5,763 |  |  | 521 |  |  | 794 |
Expected return on plan assets | (6,155) |  |  | (6,297) |  |  | — |  |  | — |
Amortization of prior service cost (credit) | 156 |  |  | 183 |  |  | — |  |  | — |
Recognized actuarial loss | 5,281 |  |  | 4,264 |  |  | (8) |  |  | — |
Net periodic benefit expense | 5,350 |  |  | 6,079 |  |  | 840 |  |  | 1,240 |
Other - curtailment | — |  |  | 586 |  |  | — |  |  | (1,825) |
Other - special termination benefits | — |  |  | 8,435 |  |  | — |  |  | — |
Total net periodic benefit expense | $ | 5,350 |  |  | 15,100 |  |  | 840 |  |  | (585) |
| Six Months Ended June 30,
| Pension Benefits |  | Other Postretirement Benefits
(Thousands of dollars) | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 3,536 |  |  | 4,332 |  |  | 653 |  |  | 893 |
Interest cost | 8,586 |  |  | 11,554 |  |  | 1,042 |  |  | 1,588 |
Expected return on plan assets | (12,288) |  |  | (12,641) |  |  | — |  |  | — |
Amortization of prior service cost (credit) | 312 |  |  | 366 |  |  | — |  |  | — |
Recognized actuarial loss | 10,560 |  |  | 8,533 |  |  | (15) |  |  | — |
Net periodic benefit expense | $ | 10,706 |  |  | 12,144 |  |  | 1,680 |  |  | 2,481 |
Other - curtailment | — |  |  | 586 |  |  | — |  |  | (1,825) |
Other - special termination benefits | — |  |  | 8,435 |  |  | — |  |  | — |
Total net periodic benefit expense | $ | 10,706 |  |  | 21,165 |  |  | 1,680 |  |  | 656 |

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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=123447040&loc=d3e1928-114920 + Details
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