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Pension Plan (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Schedule of net benefit cost
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