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Pension Plans and Other Postretirement Benefits | 3 Months Ended
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Mar. 31, 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 periods ended March 31, 2021 and 2020 were as follows (in thousands):
|  |  | Three Months Ended March 31,
|  |  |  |  | 2021 |  | 2020
Pension Benefits Cost (Credit): |  |  |  |  |  |  |
Service cost |  |  |  |  | $ | 1,179 |  |  | $ | 1,214 |
Interest cost |  |  |  |  | 5,119 |  |  | 6,687 |
Expected return on assets |  |  |  |  | (10,893) |  |  | (10,063) |
Amortization of prior service benefit |  |  |  |  | 29 |  |  | (51) |
Total net pension benefits credit |  |  |  |  | $ | (4,566) |  |  | $ | (2,213) |
Postretirement Benefits Cost: |  |  |  |  |  |  |
Service cost |  |  |  |  | $ | 31 |  |  | $ | 26 |
Interest cost |  |  |  |  | 309 |  |  | 468 |
Total net postretirement benefits cost |  |  |  |  | $ | 340 |  |  | $ | 494 |
Total net pension and postretirement benefits credit |  |  |  |  | $ | (4,226) |  |  | $ | (1,719) |
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, 2021 and 2020, we made contributions of $14.7 million and $5.4 million, respectively, to our qualified and nonqualified pension plans. We paid $0.6 million and $0.7 million, respectively, in premiums to the U.S. postretirement benefit plan during the three-month periods ended March 31, 2021 and 2020, respectively.

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