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Pension Plan | 6 Months Ended
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Jun. 30, 2022
Retirement Benefits [Abstract] |
Pension Plan | Pension Plan Net periodic pension cost consists of the following:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $ | 269 |  |  | $ | 248 |  |  | $ | 538 |  |  | $ | 496 |
Interest cost on projected benefit obligation | 537 |  |  | 451 |  |  | 1,074 |  |  | 902 |
Expected return on plan assets | (1,324) |  |  | (1,289) |  |  | (2,648) |  |  | (2,578) |
Net amortization and deferral | 648 |  |  | 832 |  |  | 1,296 |  |  | 1,664 |
Net periodic pension cost | $ | 130 |  |  | $ | 242 |  |  | $ | 260 |  |  | $ | 484 |
We do not expect to make any pension contributions during 2022. Non-service pension cost/(benefit) was immaterial for the three and six months ended June 30, 2022 and 2021.

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