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Pension and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Pension and Other Postretirement Benefits
Pension and other postretirement benefits expenses consisted of the following:
Three Months Ended
March 31,
Pensions20212020
Service cost$1,741 $1,649 
Interest cost3,172 3,817 
Expected return on plan assets(6,972)(7,393)
Amortization of prior service cost85 80 
Amortization of actuarial losses3,926 3,339 
Net periodic benefit cost$1,952 $1,492 

Three Months Ended
March 31,
Other Postretirement Benefits20212020
Service cost$25 $22 
Interest cost206 264 
Amortization of prior service cost7 7 
Amortization of actuarial losses70 23 
Net periodic benefit cost$308 $316 
The service cost component of net periodic benefit cost is included within cost of sales and selling and administrative expenses. The components of net periodic benefit cost other than the service cost component are included in Other Income (Expense) on the Consolidated Statements of Income.