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Pension Plans and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 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 and six-month periods ended June 30, 2024 and 2023 were as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Pension Benefits Cost (Credit): |  |  |  |  |  |  |
Service cost | $ | 1,563 |  |  | $ | 1,334 |  |  | $ | 3,129 |  |  | $ | 2,655 |
Interest cost | 8,140 |  |  | 8,558 |  |  | 16,285 |  |  | 17,100 |
Expected return on assets | (8,838) |  |  | (8,415) |  |  | (17,668) |  |  | (16,824) |
Amortization of prior service benefit | 19 |  |  | 21 |  |  | 39 |  |  | 41 |
Total net pension benefits cost | $ | 884 |  |  | $ | 1,498 |  |  | $ | 1,785 |  |  | $ | 2,972 |
Postretirement Benefits Cost: |  |  |  |  |  |  |
Service cost | $ | 11 |  |  | $ | 12 |  |  | $ | 23 |  |  | $ | 24 |
Interest cost | 361 |  |  | 469 |  |  | 721 |  |  | 937 |
Total net postretirement benefits cost | $ | 372 |  |  | $ | 481 |  |  | $ | 744 |  |  | $ | 961 |
Total net pension and postretirement benefits cost | $ | 1,256 |  |  | $ | 1,979 |  |  | $ | 2,529 |  |  | $ | 3,933 |
All components of net benefit cost, other than service cost, are included in Other income, net on the consolidated statements of (loss) income. During the three-month and six-month periods ended June 30, 2024, the Company made contributions of $4.6 million and $9.4 million, respectively, to its qualified and nonqualified pension plans and the U.S. postretirement benefit plan. During the three-month and six-month periods ended June 30, 2023, the Company made contributions of $5.8 million and $8.6 million, respectively, to its qualified and nonqualified pension plans and the U.S. postretirement benefit plan.

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