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Retirement Benefits | 6 Months Ended
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Jun. 30, 2022
Retirement Benefits [Abstract] |
Retirement Benefits | Retirement Benefits The components of the net periodic pension benefit credit were as follows:
| Three Months Ended |  | Six Months Ended
| June 30, 2022 |  | June 30, 2021 |  | June 30, 2022 |  | June 30, 2021
| (Dollars in thousands)
Service cost | $ | 3,270 |  |  | $ | 3,789 |  |  | $ | 6,570 |  |  | $ | 7,577 |
Interest cost | 5,140 |  |  | 4,355 |  |  | 10,299 |  |  | 8,709 |
Expected return on plan assets | (17,315) |  |  | (19,850) |  |  | (34,629) |  |  | (39,698) |
Amortization of prior service cost | 53 |  |  | 58 |  |  | 108 |  |  | 116 |
Amortization of actuarial losses | 1,157 |  |  | 3,028 |  |  | 2,312 |  |  | 6,054 |
Net periodic benefit credit | $ | (7,695) |  |  | $ | (8,620) |  |  | $ | (15,340) |  |  | $ | (17,242) |
The components of the net periodic other postretirement benefit credit were as follows:
| Three Months Ended |  | Six Months Ended
| June 30, 2022 |  | June 30, 2021 |  | June 30, 2022 |  | June 30, 2021
| (Dollars in thousands)
Service cost | $ | 26 |  |  | $ | 28 |  |  | $ | 51 |  |  | $ | 56 |
Interest cost | 109 |  |  | 95 |  |  | 218 |  |  | 190 |
Amortization of prior service credit | (416) |  |  | (457) |  |  | (832) |  |  | (913) |
Amortization of actuarial gains | (77) |  |  | (47) |  |  | (154) |  |  | (95) |
Net periodic benefit credit | $ | (358) |  |  | $ | (381) |  |  | $ | (717) |  |  | $ | (762) |

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