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Pension and Other Post-Retirement Benefits
 3 Months Ended
Mar. 31, 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 March 31,
20212020
Service cost$368 $226 
Interest cost82 79 
Expected return on plan assets(52)(40)
Amortization of actuarial gains(6)(19)
Net periodic benefit cost$392 $246 
Interest cost and expected return on plan assets are recorded in Interest expense, net on the accompanying Interim Condensed Consolidated Statements of Operations.