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Retirement Benefits | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Retirement Benefits | Retirement Benefits The components of the net periodic pension benefit cost were as follows:
| Three Months Ended |  | Six Months Ended
| June 30, 2024 |  | June 30, 2023 |  | June 30, 2024 |  | June 30, 2023
| (Dollars in thousands)
Service cost | $ | 2,164 |  |  | $ | 2,234 |  |  | $ | 4,329 |  |  | $ | 4,463 |
Interest cost | 8,408 |  |  | 8,724 |  |  | 16,821 |  |  | 17,433 |
Expected return on plan assets | (10,771) |  |  | (10,187) |  |  | (21,542) |  |  | (20,376) |
Amortization of prior service cost | 23 |  |  | 25 |  |  | 46 |  |  | 53 |
Amortization of actuarial losses | 1,853 |  |  | 2,939 |  |  | 3,705 |  |  | 5,884 |
Net periodic benefit cost | $ | 1,677 |  |  | $ | 3,735 |  |  | $ | 3,359 |  |  | $ | 7,457 |
The components of the net periodic other postretirement benefit cost (credit) were as follows:
| Three Months Ended |  | Six Months Ended
| June 30, 2024 |  | June 30, 2023 |  | June 30, 2024 |  | June 30, 2023
| (Dollars in thousands)
Service cost | $ | 7 |  |  | $ | 12 |  |  | $ | 14 |  |  | $ | 26 |
Interest cost | 167 |  |  | 189 |  |  | 332 |  |  | 378 |
Amortization of prior service credit | (5) |  |  | (233) |  |  | (10) |  |  | (468) |
Amortization of actuarial gains | (84) |  |  | (162) |  |  | (168) |  |  | (323) |
Net periodic benefit cost (credit) | $ | 85 |  |  | $ | (194) |  |  | $ | 168 |  |  | $ | (387) |

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