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v3.23.1

Retirement Benefits | 3 Months Ended
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Mar. 31, 2023
Retirement Benefits [Abstract] |
Retirement Benefits | Retirement Benefits The components of the net periodic pension benefit cost (credit) for the three months ended March 31 were as follows:
|  |  |  |  | 2023 |  | 2022
|  |  |  |  | (Dollars in thousands)
Service cost |  |  |  |  | $ | 2,229 |  |  | $ | 3,300 |
Interest cost |  |  |  |  | 8,709 |  |  | 5,159 |
Expected return on plan assets |  |  |  |  | (10,189) |  |  | (17,314) |
Amortization of prior service cost |  |  |  |  | 28 |  |  | 55 |
Amortization of actuarial losses |  |  |  |  | 2,945 |  |  | 1,155 |
Net periodic benefit cost (credit) |  |  |  |  | $ | 3,722 |  |  | $ | (7,645) |
The components of the net periodic other postretirement benefit credit for the three months ended March 31 were as follows:
|  |  |  |  | 2023 |  | 2022
|  |  |  |  | (Dollars in thousands)
Service cost |  |  |  |  | $ | 14 |  |  | $ | 25 |
Interest cost |  |  |  |  | 189 |  |  | 109 |
Amortization of prior service credit |  |  |  |  | (235) |  |  | (416) |
Amortization of actuarial gains |  |  |  |  | (161) |  |  | (77) |
Net periodic benefit credit |  |  |  |  | $ | (193) |  |  | $ | (359) |

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