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Pension Benefits and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 2021
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, 2021, 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. Pension Termination Surplus Funds On October 17, 2019, our Chief Executive Officer approved the termination of the Rogers Corporation Defined Benefit Pension Plan (following its merger with the Hourly Employees Pension Plan of Arlon LLC, Microwave Material and Silicone Technologies Divisions, Bear, Delaware (collectively, the Merged Plan)). We provided participants of the Merged Plan an option to elect either a lump sum distribution or an annuity. A group annuity contract was purchased with an insurance company for all participants who did not elect a lump sum distribution. The insurance company became responsible for administering and paying pension benefit payments effective January 1, 2020. Upon completion of the pension termination and settlement processes for the Merged Plan, we had a $9.7 million remaining pension surplus investment balance. In July 2020, we transferred $7.4 million of the pension surplus investment balance to a suspense account held within a trust for the Rogers Employee Savings and Investment Plan (RESIP), a 401(k) plan for domestic employees. The investment balance not transferred to the trust suspense account will be used to pay any final plan expenses, after which the remainder of these funds will be moved to the RESIP trust suspense account. The funds in the RESIP trust suspense account have been, and will continue to be, used to fund certain employer contributions. As of June 30, 2021, the combined remaining pension surplus investment balance was approximately $7.7 million. 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) | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |  |  | $ | 17 |  |  | $ | 30 |  |  | $ | 34 |
Interest cost | 184 |  |  | 231 |  |  | 368 |  |  | 462 |  |  | 6 |  |  | 10 |  |  | 12 |  |  | 20 |
Expected return of plan assets | (390) |  |  | (393) |  |  | (780) |  |  | (786) |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service credit | — |  |  | — |  |  | — |  |  | — |  |  | (24) |  |  | (28) |  |  | (48) |  |  | (56) |
Amortization of net loss | 98 |  |  | 114 |  |  | 196 |  |  | 228 |  |  | — |  |  | — |  |  | — |  |  | — |
Settlement benefit | — |  |  | (63) |  |  | — |  |  | (63) |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit (credit) cost | $ | (108) |  |  | $ | (111) |  |  | $ | (216) |  |  | $ | (159) |  |  | $ | (3) |  |  | $ | (1) |  |  | $ | (6) |  |  | $ | (2) |
Employer Contributions There were no required or voluntary contributions made to the Union Plan or the Merged Plan for each of the three and six-month periods ended June 30, 2021 and 2020. Additionally, we are not required to make additional contributions to the Union Plan for the remainder of 2021. 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-month periods ended June 30, 2021 and 2020, using cash from operations.

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