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Employee and Retiree Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2020
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 nine-month periods ended September 30, 2020 and 2019.
| Three Months Ended September 30,
| Pension Benefits |  | Other Postretirement Benefits
(Thousands of dollars) | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | 1,664 |  |  | 2,064 |  |  | 342 |  |  | 421 |
Interest cost | 4,827 |  |  | 7,151 |  |  | 612 |  |  | 945 |
Expected return on plan assets | (5,773) |  |  | (6,455) |  |  | — |  |  | — |
Amortization of prior service cost (credit) | 149 |  |  | 248 |  |  | — |  |  | (98) |
Recognized actuarial loss | 5,690 |  |  | 3,516 |  |  | (24) |  |  | — |
Net periodic benefit expense | $ | 6,557 |  |  | 6,524 |  |  | 930 |  |  | 1,268 |
| Nine Months Ended September 30,
| Pension Benefits |  | Other Postretirement Benefits
(Thousands of dollars) | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | 5,996 |  |  | 6,188 |  |  | 1,235 |  |  | 1,261 |
Interest cost | 16,381 |  |  | 21,402 |  |  | 2,200 |  |  | 2,833 |
Expected return on plan assets | (18,414) |  |  | (19,285) |  |  | — |  |  | — |
Amortization of prior service cost (credit) | 515 |  |  | 741 |  |  | — |  |  | (293) |
Recognized actuarial loss | 14,223 |  |  | 10,538 |  |  | (24) |  |  | — |
Net periodic benefit expense | 18,701 |  |  | 19,584 |  |  | 3,411 |  |  | 3,801 |
Other - curtailment | 586 |  |  | — |  |  | (1,825) |  |  | — |
Other - special termination benefits | 8,435 |  |  | — |  |  | — |  |  | — |
Total net periodic benefit expense | $ | 27,722 |  |  | 19,584 |  |  | 1,586 |  |  | 3,801 |

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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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