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Pension Plans and Other Postretirement Benefits | 3 Months Ended
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Mar. 31, 2024
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, 2024 and 2023 were as follows (in thousands):
|  |  | Three Months Ended March 31,
|  |  |  |  | 2024 |  | 2023
Pension Benefits Cost (Credit): |  |  |  |  |  |  |
Service cost |  |  |  |  | $ | 1,566 |  |  | $ | 1,321 |
Interest cost |  |  |  |  | 8,145 |  |  | 8,542 |
Expected return on assets |  |  |  |  | (8,830) |  |  | (8,409) |
Amortization of prior service benefit |  |  |  |  | 20 |  |  | 20 |
Total net pension benefits cost |  |  |  |  | $ | 901 |  |  | $ | 1,474 |
Postretirement Benefits Cost: |  |  |  |  |  |  |
Service cost |  |  |  |  | $ | 12 |  |  | $ | 12 |
Interest cost |  |  |  |  | 360 |  |  | 468 |
Total net postretirement benefits cost |  |  |  |  | $ | 372 |  |  | $ | 480 |
Total net pension and postretirement benefits cost |  |  |  |  | $ | 1,273 |  |  | $ | 1,954 |
All components of net benefit cost, other than service cost, are included in Other income, net on the consolidated statements of income. During the three-month periods ended March 31, 2024 and 2023, the Company made contributions of $4.8 million and $2.8 million, respectively, to its qualified and nonqualified pension plans and the U.S. postretirement benefit plan.

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