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Pension Benefits and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 2023
Retirement Benefits [Abstract] |
Pension Benefit and Other Postretirement Benefits | Pension Benefits and Other Postretirement Benefits Pension and Other Postretirement Benefit Plans As of June 30, 2023, we had one qualified noncontributory defined benefit pension plan, the Rogers Corporation Employees’ Pension Plan (the Union Plan), which was frozen and ceased accruing benefits in 2013. Additionally, we sponsor other postretirement benefit plans, including multiple fully insured or self-funded medical plans and life insurance plans for certain retirees. The measurement date for all plans is December 31 st for each respective plan year. Components of Net Periodic Benefit (Credit) Cost The components of net periodic benefit (credit) cost were as follows:
| Pension Benefits |  | Other Postretirement Benefits
| Three Months Ended |  | Six Months Ended |  | Three Months Ended |  | Six Months Ended
| June 30, |  | June 30, |  | June 30, |  | June 30,
(Dollars in thousands) | 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 19 |  |  | $ | 10 |  |  | $ | 38 |  |  | $ | 20 |
Interest cost | 268 |  |  | 191 |  |  | 536 |  |  | 382 |  |  | 17 |  |  | 8 |  |  | 34 |  |  | 16 |
Expected return of plan assets | (356) |  |  | (340) |  |  | (712) |  |  | (680) |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service credit | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of net loss (gain) | 122 |  |  | 111 |  |  | 244 |  |  | 222 |  |  | (2) |  |  | — |  |  | (4) |  |  | — |
Net periodic benefit (credit) cost | $ | 34 |  |  | $ | (38) |  |  | $ | 68 |  |  | $ | (76) |  |  | $ | 34 |  |  | $ | 18 |  |  | $ | 68 |  |  | $ | 36 |
Employer Contributions There were no required or voluntary contributions made to the Union Plan for each of the three and six months ended June 30, 2023 and 2022. Additionally, we are not required to make additional contributions to the Union Plan for the remainder of 2023. As there is no funding requirement for the other postretirement benefit plans, we funded these benefit payments as incurred, which were immaterial for each of the three and six months ended June 30, 2023 and 2022, using cash from operations.

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