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Pension Plans and Other Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Domestic and Foreign Pension and Postretirement Defined Benefit Plans
The components of pension and postretirement benefits cost (credit) for the three-month and nine-month periods ended September 30, 2021 and 2020 were as follows (in thousands):
Three Months Ended
September 30,
Nine Months Ended
September 30,
2021202020212020
Pension Benefits Cost (Credit):
Service cost$1,425 $1,202 $3,776 $3,623 
Interest cost5,113 6,696 15,352 20,049 
Expected return on assets(10,893)(10,065)(32,687)(30,156)
Amortization of prior service benefit29 87 27 
Total net pension benefits credit$(4,326)$(2,158)$(13,472)$(6,457)
Postretirement Benefits Cost:
Service cost$31 $27 $93 $79 
Interest cost309 468 928 1,403 
Total net postretirement benefits cost$340 $495 $1,021 $1,482 
Total net pension and postretirement benefits credit$(3,986)$(1,663)$(12,451)$(4,975)