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Pension Plans and Other Postretirement Benefits | 9 Months Ended
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Sep. 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 nine-month periods ended September 30, 2020 and 2019 were as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Pension Benefits Cost (Credit): |  |  |  |  |  |  |
Service cost | $ | 1,202 |  |  | $ | 1,118 |  |  | $ | 3,623 |  |  | $ | 3,371 |
Interest cost | 6,696 |  |  | 8,314 |  |  | 20,049 |  |  | 24,854 |
Expected return on assets | (10,065) |  |  | (9,414) |  |  | (30,156) |  |  | (28,311) |
Amortization of prior service benefit | 9 |  |  | (5) |  |  | 27 |  |  | 7 |
Total net pension benefits (credit) cost | $ | (2,158) |  |  | $ | 13 |  |  | $ | (6,457) |  |  | $ | (79) |
Postretirement Benefits Cost: |  |  |  |  |  |  |
Service cost | $ | 27 |  |  | $ | 24 |  |  | $ | 79 |  |  | $ | 73 |
Interest cost | 468 |  |  | 549 |  |  | 1,403 |  |  | 1,647 |
Total net postretirement benefits cost | $ | 495 |  |  | $ | 573 |  |  | $ | 1,482 |  |  | $ | 1,720 |
Total net pension and postretirement benefits (credit) cost | $ | (1,663) |  |  | $ | 586 |  |  | $ | (4,975) |  |  | $ | 1,641 |
All components of net benefit cost (credit), other than service cost, are included in Other expenses, net on the consolidated statements of income. During the three-month and nine-month periods ended September 30, 2020, we made contributions of $2.7 million and $7.9 million, respectively, to our qualified and nonqualified pension plans. During the three-month and nine-month periods ended September 30, 2019, we made contributions of $2.1 million and $8.6 million, respectively, to our qualified and nonqualified pension plans. We paid $0.9 million and $2.5 million in premiums to the U.S. postretirement benefit plan during the three-month and nine-month periods ended September 30, 2020, respectively. During the three-month and nine-month periods ended September 30, 2019, we paid $0.8 million and $2.1 million, respectively, in premiums to the U.S. postretirement benefit plan.

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