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Pension and Other Post-Retirement Benefits
 9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Pension and Other Post-Retirement Benefits Pension and Other Post‑Retirement Benefits The components of net periodic benefit cost changes in plan assets and benefit obligations recognized as follows:
Three Months Ended September 30,
20212020
Service cost$368 $226 
Interest cost82 79 
Expected return on plan assets(52)(40)
Amortization of actuarial gains(4)(19)
Net periodic benefit cost$394 $246 
Nine Months Ended September 30,
20212020
Service cost$1,104 $661 
Interest cost246 235 
Expected return on plan assets(156)(118)
Amortization of actuarial gains(12)(57)
Net periodic benefit cost$1,182 $721 

Interest cost and expected return on plan assets are recorded in Interest expense, net on the accompanying Interim Condensed Consolidated Statements of Operations.