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Pension Plans and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
Pension Plans and Other Postretirement Benefits | Pension Plans and Other Postretirement Benefits: The components of pension and postretirement benefits cost (credit) for the three-month and six-month periods ended June 30, 2021 and 2020 were as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Pension Benefits Cost (Credit): |  |  |  |  |  |  |
Service cost | $ | 1,172 |  |  | $ | 1,207 |  |  | $ | 2,351 |  |  | $ | 2,421 |
Interest cost | 5,120 |  |  | 6,666 |  |  | 10,239 |  |  | 13,353 |
Expected return on assets | (10,901) |  |  | (10,028) |  |  | (21,794) |  |  | (20,091) |
Amortization of prior service benefit | 29 |  |  | 69 |  |  | 58 |  |  | 18 |
Total net pension benefits credit | $ | (4,580) |  |  | $ | (2,086) |  |  | $ | (9,146) |  |  | $ | (4,299) |
Postretirement Benefits Cost: |  |  |  |  |  |  |
Service cost | $ | 31 |  |  | $ | 26 |  |  | $ | 62 |  |  | $ | 52 |
Interest cost | 310 |  |  | 467 |  |  | 619 |  |  | 935 |
Total net postretirement benefits cost | $ | 341 |  |  | $ | 493 |  |  | $ | 681 |  |  | $ | 987 |
Total net pension and postretirement benefits credit | $ | (4,239) |  |  | $ | (1,593) |  |  | $ | (8,465) |  |  | $ | (3,312) |
All components of net benefit cost (credit), other than service cost, are included in Other income (expense), net on the consolidated statements of income. During the three-month and six-month periods ended June 30, 2021, we made contributions of $4.2 million and $18.9 million, respectively, to our qualified and nonqualified pension plans. During the three-month and six-month periods ended June 30, 2020, we made contributions of $2.1 million and $5.2 million, respectively, to our qualified and nonqualified pension plans. We paid $0.8 million and $1.4 million, respectively, in premiums to the U.S. postretirement benefit plan during the three-month and six-month periods ended June 30, 2021, respectively. During the three-month and six-month periods ended June 30, 2020, we paid $0.8 million and $1.5 million, respectively, in premiums to the U.S. postretirement benefit plan.

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