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Pension Plan | 9 Months Ended
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Sep. 30, 2020
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, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | 179 |  |  | $ | 253 |  |  | $ | 537 |  |  | $ | 759 |
Interest cost on projected benefit obligation | 639 |  |  | 782 |  |  | 1,917 |  |  | 2,346 |
Expected return on plan assets | (1,255) |  |  | (1,181) |  |  | (3,765) |  |  | (3,543) |
Net amortization and deferral | 705 |  |  | 720 |  |  | 2,115 |  |  | 2,160 |
Net periodic pension cost | $ | 268 |  |  | $ | 574 |  |  | $ | 804 |  |  | $ | 1,722 |
We do not expect to make any pension contributions during 2020. Non-service cost of $0.1 million and $0.3 million for the three months ended September 30, 2020 and 2019, respectively, and $0.3 million and $1.0 million for the nine months ended September 30, 2020 and 2019, respectively, are included in other expense in the consolidated condensed statements of comprehensive income (loss).

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