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Retirement Benefits | 6 Months Ended
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Jun. 30, 2023
Retirement Benefits [Abstract] |
Retirement Benefits | Retirement Benefits The components of the net periodic pension benefit cost (credit) were as follows:
| Three Months Ended |  | Six Months Ended
| June 30, 2023 |  | June 30, 2022 |  | June 30, 2023 |  | June 30, 2022
| (Dollars in thousands)
Service cost | $ | 2,234 |  |  | $ | 3,270 |  |  | $ | 4,463 |  |  | $ | 6,570 |
Interest cost | 8,724 |  |  | 5,140 |  |  | 17,433 |  |  | 10,299 |
Expected return on plan assets | (10,187) |  |  | (17,315) |  |  | (20,376) |  |  | (34,629) |
Amortization of prior service cost | 25 |  |  | 53 |  |  | 53 |  |  | 108 |
Amortization of actuarial losses | 2,939 |  |  | 1,157 |  |  | 5,884 |  |  | 2,312 |
Net periodic benefit cost (credit) | $ | 3,735 |  |  | $ | (7,695) |  |  | $ | 7,457 |  |  | $ | (15,340) |
The components of the net periodic other postretirement benefit credit were as follows:
| Three Months Ended |  | Six Months Ended
| June 30, 2023 |  | June 30, 2022 |  | June 30, 2023 |  | June 30, 2022
| (Dollars in thousands)
Service cost | $ | 12 |  |  | $ | 26 |  |  | $ | 26 |  |  | $ | 51 |
Interest cost | 189 |  |  | 109 |  |  | 378 |  |  | 218 |
Amortization of prior service credit | (233) |  |  | (416) |  |  | (468) |  |  | (832) |
Amortization of actuarial gains | (162) |  |  | (77) |  |  | (323) |  |  | (154) |
Net periodic benefit credit | $ | (194) |  |  | $ | (358) |  |  | $ | (387) |  |  | $ | (717) |

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