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Retirement Benefits | 3 Months Ended
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Mar. 31, 2022
Retirement Benefits [Abstract] |
Retirement Benefits | Retirement Benefits The components of the net periodic pension benefit credit for the three months ended March 31 were as follows:
| 2022 |  | 2021 |  |  |  |
| (Dollars in thousands)
Service cost | $ | 3,300 |  |  | $ | 3,788 |  |  |  |  |
Interest cost | 5,159 |  |  | 4,354 |  |  |  |  |
Expected return on plan assets | (17,314) |  |  | (19,848) |  |  |  |  |
Amortization of prior service cost | 55 |  |  | 58 |  |  |  |  |
Amortization of actuarial losses | 1,155 |  |  | 3,026 |  |  |  |  |
Net periodic benefit credit | $ | (7,645) |  |  | $ | (8,622) |  |  |  |  |
The components of the net periodic other postretirement benefit credit for the three months ended March 31 were as follows:
| 2022 |  | 2021 |  |  |  |
| (Dollars in thousands)
Service cost | $ | 25 |  |  | $ | 28 |  |  |  |  |
Interest cost | 109 |  |  | 95 |  |  |  |  |
Amortization of prior service credit | (416) |  |  | (456) |  |  |  |  |
Amortization of actuarial gains | (77) |  |  | (48) |  |  |  |  |
Net periodic benefit credit | $ | (359) |  |  | $ | (381) |  |  |  |  |

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