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Pension Plans and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 2020
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, 2020 and 2019 were as follows (in thousands):
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Pension Benefits Cost (Credit): |  |  |  |  |  |  |
Service cost | $ | 1,207 |  |  | $ | 1,123 |  |  | $ | 2,421 |  |  | $ | 2,253 |
Interest cost | 6,666 |  |  | 8,220 |  |  | 13,353 |  |  | 16,540 |
Expected return on assets | (10,028) |  |  | (9,445) |  |  | (20,091) |  |  | (18,897) |
Amortization of prior service benefit | 69 |  |  | 6 |  |  | 18 |  |  | 12 |
Total net pension benefits credit | $ | (2,086) |  |  | $ | (96) |  |  | $ | (4,299) |  |  | $ | (92) |
Postretirement Benefits Cost: |  |  |  |  |  |  |
Service cost | $ | 26 |  |  | $ | 25 |  |  | $ | 52 |  |  | $ | 49 |
Interest cost | 467 |  |  | 549 |  |  | 935 |  |  | 1,098 |
Total net postretirement benefits cost | $ | 493 |  |  | $ | 574 |  |  | $ | 987 |  |  | $ | 1,147 |
Total net pension and postretirement benefits (credit) cost | $ | (1,593) |  |  | $ | 478 |  |  | $ | (3,312) |  |  | $ | 1,055 |
All components of net benefit cost (credit), other than service cost, are included in Other (expenses) income, net on the consolidated statements of income. 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. During the three-month and six-month periods ended June 30, 2019, we made contributions of $3.8 million and $6.5 million, respectively, to our qualified and nonqualified pension plans. We paid $0.8 million and $1.5 million in premiums to the U.S. postretirement benefit plan during the three-month and six-month periods ended June 30, 2020, respectively. During the three-month and six-month periods ended June 30, 2019, we paid $0.4 million and $1.3 million, respectively, in premiums to the U.S. postretirement benefit plan.

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