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v3.23.3

Retirement Benefits | 9 Months Ended
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Sep. 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 |  | Nine Months Ended
| Sept. 30, 2023 |  | Sept. 30, 2022 |  | Sept. 30, 2023 |  | Sept. 30, 2022
| (Dollars in thousands)
Service cost | $ | 1,962 |  |  | $ | 2,937 |  |  | $ | 6,425 |  |  | $ | 9,507 |
Interest cost | 8,617 |  |  | 5,131 |  |  | 26,050 |  |  | 15,430 |
Expected return on plan assets | (10,211) |  |  | (17,220) |  |  | (30,587) |  |  | (51,849) |
Amortization of prior service cost | 29 |  |  | 62 |  |  | 82 |  |  | 170 |
Amortization of actuarial losses | 2,845 |  |  | 1,370 |  |  | 8,729 |  |  | 3,682 |
Net periodic benefit cost (credit) | $ | 3,242 |  |  | $ | (7,720) |  |  | $ | 10,699 |  |  | $ | (23,060) |
The components of the net periodic other postretirement benefit credit were as follows:
| Three Months Ended |  | Nine Months Ended
| Sept. 30, 2023 |  | Sept. 30, 2022 |  | Sept. 30, 2023 |  | Sept. 30, 2022
| (Dollars in thousands)
Service cost | $ | 12 |  |  | $ | 5 |  |  | $ | 38 |  |  | $ | 56 |
Interest cost | 181 |  |  | 96 |  |  | 559 |  |  | 314 |
Amortization of prior service credit | (237) |  |  | (415) |  |  | (705) |  |  | (1,247) |
Amortization of actuarial gains | (141) |  |  | (75) |  |  | (464) |  |  | (229) |
Net periodic benefit credit | $ | (185) |  |  | $ | (389) |  |  | $ | (572) |  |  | $ | (1,106) |

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