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Pension and Other Post-Retirement Benefits | 9 Months Ended
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Sep. 30, 2021
Retirement Benefits [Abstract] |
Pension and Other Post-Retirement Benefits | Pension and Other Post‑Retirement Benefits The components of net periodic benefit cost changes in plan assets and benefit obligations recognized as follows:
| Three Months Ended September 30, |  |
| 2021 |  | 2020 |  |
Service cost | $ | 368 |  |  | $ | 226 |  |  |
Interest cost | 82 |  |  | 79 |  |  |
Expected return on plan assets | (52) |  |  | (40) |  |  |
Amortization of actuarial gains | (4) |  |  | (19) |  |  |
Net periodic benefit cost | $ | 394 |  |  | $ | 246 |  |  |
| Nine Months Ended September 30, |  |
| 2021 |  | 2020 |  |
Service cost | $ | 1,104 |  |  | $ | 661 |  |  |
Interest cost | 246 |  |  | 235 |  |  |
Expected return on plan assets | (156) |  |  | (118) |  |  |
Amortization of actuarial gains | (12) |  |  | (57) |  |  |
Net periodic benefit cost | $ | 1,182 |  |  | $ | 721 |  |  |
Interest cost and expected return on plan assets are recorded in Interest expense, net on the accompanying Interim Condensed Consolidated Statements of Operations.

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