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Pension Plan
 9 Months Ended
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,
 2021202020212020
Service cost$248 $179 $744 $537 
Interest cost on projected benefit obligation451 639 1,353 1,917 
Expected return on plan assets(1,289)(1,255)(3,867)(3,765)
Net amortization and deferral832 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.