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Pension Plans and Other Postretirement Benefits | 9 Months Ended
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Sep. 30, 2022
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, 2022 and 2021 were as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Pension Benefits Cost (Credit): |  |  |  |  |  |  |
Service cost | $ | 959 |  |  | $ | 1,425 |  |  | $ | 2,914 |  |  | $ | 3,776 |
Interest cost | 5,530 |  |  | 5,113 |  |  | 16,703 |  |  | 15,352 |
Expected return on assets | (10,884) |  |  | (10,893) |  |  | (33,028) |  |  | (32,687) |
Amortization of prior service benefit | 21 |  |  | 29 |  |  | 68 |  |  | 87 |
Total net pension benefits credit | $ | (4,374) |  |  | $ | (4,326) |  |  | $ | (13,343) |  |  | $ | (13,472) |
Postretirement Benefits Cost: |  |  |  |  |  |  |
Service cost | $ | 21 |  |  | $ | 31 |  |  | $ | 64 |  |  | $ | 93 |
Interest cost | 327 |  |  | 309 |  |  | 980 |  |  | 928 |
Total net postretirement benefits cost | $ | 348 |  |  | $ | 340 |  |  | $ | 1,044 |  |  | $ | 1,021 |
Total net pension and postretirement benefits credit | $ | (4,026) |  |  | $ | (3,986) |  |  | $ | (12,299) |  |  | $ | (12,451) |
All components of net benefit cost (credit), other than service cost, are included in Other income, net on the consolidated statements of income. During the three-month and nine-month periods ended September 30, 2022, the Company made contributions of $2.5 million and $8.9 million, respectively, to its qualified and nonqualified pension plans. During the three-month and nine-month periods ended September 30, 2021, the Company made contributions of $3.2 million and $22.1 million, respectively, to its qualified and nonqualified pension plans. The contributions made in 2021 included deferred contributions from the prior year resulting from uncertainty during the COVID-19 pandemic. The Company paid $0.7 million and $2.1 million in premiums to the U.S. postretirement benefit plan during the three-month and nine-month periods ended September 30, 2022, respectively. During the three-month and nine-month periods ended September 30, 2021, the Company paid $0.7 million and $2.1 million, respectively, in premiums to the U.S. postretirement benefit

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