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Pension Plan
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Pension Plan Pension Plan
Net periodic pension cost consists of the following: 

Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Service cost$248 $179 $496 $358 
Interest cost on projected benefit obligation451 639 902 1,278 
Expected return on plan assets(1,289)(1,255)(2,578)(2,510)
Net amortization and deferral832 705 1,664 1,410 
Net periodic pension cost$242 $268 $484 $536 
 
We do not expect to make any pension contributions during 2021. Non-service cost of $0.1 million and $0.2 million for the three and six months ended June 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 six months ended June 30, 2021.