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Retirement Benefits | 6 Months Ended
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Jun. 30, 2025
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, 2025 |  | June 30, 2024 |  | June 30, 2025 |  | June 30, 2024
| (Dollars in thousands)
Service cost | $ | 1,968 |  |  | $ | 2,164 |  |  | $ | 3,912 |  |  | $ | 4,329 |
Interest cost | 8,177 |  |  | 8,408 |  |  | 16,296 |  |  | 16,821 |
Expected return on plan assets | (10,256) |  |  | (10,771) |  |  | (20,513) |  |  | (21,542) |
Amortization of prior service cost | 5 |  |  | 23 |  |  | 13 |  |  | 46 |
Amortization of actuarial losses | 1,883 |  |  | 1,853 |  |  | 3,776 |  |  | 3,705 |
Net periodic benefit cost | $ | 1,777 |  |  | $ | 1,677 |  |  | $ | 3,484 |  |  | $ | 3,359 |
The components of the net periodic other postretirement benefit cost were as follows:
| Three Months Ended |  | Six Months Ended
| June 30, 2025 |  | June 30, 2024 |  | June 30, 2025 |  | June 30, 2024
| (Dollars in thousands)
Service cost | $ | 6 |  |  | $ | 7 |  |  | $ | 10 |  |  | $ | 14 |
Interest cost | 151 |  |  | 167 |  |  | 302 |  |  | 332 |
Amortization of prior service credit | (14) |  |  | (5) |  |  | (29) |  |  | (10) |
Amortization of actuarial gains | (86) |  |  | (84) |  |  | (172) |  |  | (168) |
Net periodic benefit cost | $ | 57 |  |  | $ | 85 |  |  | $ | 111 |  |  | $ | 168 |

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