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Pension Plan | 9 Months Ended
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Sep. 30, 2021
Retirement Benefits [Abstract] |
Pension Plan | Pension Plan Net periodic pension cost consists of the following:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 248 |  |  | $ | 179 |  |  | $ | 744 |  |  | $ | 537 |
Interest cost on projected benefit obligation | 451 |  |  | 639 |  |  | 1,353 |  |  | 1,917 |
Expected return on plan assets | (1,289) |  |  | (1,255) |  |  | (3,867) |  |  | (3,765) |
Net amortization and deferral | 832 |  |  | 705 |  |  | 2,496 |  |  | 2,115 |
Net periodic pension cost | $ | 242 |  |  | $ | 268 |  |  | $ | 726 |  |  | $ | 804 |
We do not expect to make any pension contributions during 2021. Non-service cost of $0.1 million and $0.3 million for the three and nine months ended September 30, 2020, respectively, is included in other expense in the consolidated condensed statements of comprehensive income (loss). Non-service pension cost was immaterial for the three and nine months ended September 30, 2021.

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