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v3.22.2.2

Retirement Benefits | 9 Months Ended
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Sep. 30, 2022
Retirement Benefits [Abstract] |
Retirement Benefits | Retirement Benefits The components of the net periodic pension benefit credit were as follows:
| Three Months Ended |  | Nine Months Ended
| Sept. 30, 2022 |  | Sept. 30, 2021 |  | Sept. 30, 2022 |  | Sept. 30, 2021
| (Dollars in thousands)
Service cost | $ | 2,937 |  |  | $ | 3,177 |  |  | $ | 9,507 |  |  | $ | 10,754 |
Interest cost | 5,131 |  |  | 4,579 |  |  | 15,430 |  |  | 13,288 |
Expected return on plan assets | (17,220) |  |  | (19,892) |  |  | (51,849) |  |  | (59,590) |
Amortization of prior service cost | 62 |  |  | 67 |  |  | 170 |  |  | 183 |
Amortization of actuarial losses | 1,370 |  |  | 3,464 |  |  | 3,682 |  |  | 9,518 |
Net periodic benefit credit | $ | (7,720) |  |  | $ | (8,605) |  |  | $ | (23,060) |  |  | $ | (25,847) |
The components of the net periodic other postretirement benefit credit were as follows:
| Three Months Ended |  | Nine Months Ended
| Sept. 30, 2022 |  | Sept. 30, 2021 |  | Sept. 30, 2022 |  | Sept. 30, 2021
| (Dollars in thousands)
Service cost | $ | 5 |  |  | $ | 25 |  |  | $ | 56 |  |  | $ | 81 |
Interest cost | 96 |  |  | 82 |  |  | 314 |  |  | 272 |
Amortization of prior service credit | (415) |  |  | (460) |  |  | (1,247) |  |  | (1,373) |
Amortization of actuarial gains | (75) |  |  | (137) |  |  | (229) |  |  | (232) |
Net periodic benefit credit | $ | (389) |  |  | $ | (490) |  |  | $ | (1,106) |  |  | $ | (1,252) |

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