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Pension Plans and Other Postretirement Benefits | 3 Months Ended
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Mar. 31, 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 periods ended March 31, 2022 and 2021 were as follows (in thousands):
|  |  | Three Months Ended March 31,
|  |  |  |  | 2022 |  | 2021
Pension Benefits Cost (Credit): |  |  |  |  |  |  |
Service cost |  |  |  |  | $ | 985 |  |  | $ | 1,179 |
Interest cost |  |  |  |  | 5,605 |  |  | 5,119 |
Expected return on assets |  |  |  |  | (11,212) |  |  | (10,893) |
Amortization of prior service benefit |  |  |  |  | 24 |  |  | 29 |
Total net pension benefits credit |  |  |  |  | $ | (4,598) |  |  | $ | (4,566) |
Postretirement Benefits Cost: |  |  |  |  |  |  |
Service cost |  |  |  |  | $ | 21 |  |  | $ | 31 |
Interest cost |  |  |  |  | 327 |  |  | 309 |
Total net postretirement benefits cost |  |  |  |  | $ | 348 |  |  | $ | 340 |
Total net pension and postretirement benefits credit |  |  |  |  | $ | (4,250) |  |  | $ | (4,226) |
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 periods ended March 31, 2022 and 2021, we made contributions of $3.2 million and $14.7 million, respectively, to our qualified and nonqualified pension plans. We paid $0.6 million and $0.6 million in premiums to the U.S. postretirement benefit plan during the three-month periods ended March 31, 2022 and 2021, respectively.

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