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Pension Plans and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Pension Plans and Other Postretirement Benefits Pension Plans and Other Postretirement Benefits:
The components of pension and postretirement benefits cost (credit) for the three-month and nine-month periods ended September 30, 2023 and 2022 were as follows (in thousands):
Three Months Ended
September 30,		Nine Months Ended
September 30,
2023202220232022
Pension Benefits Cost (Credit):
Service cost$1,340 $959 $3,995 $2,914 
Interest cost8,587 5,530 25,687 16,703 
Expected return on assets(8,434)(10,884)(25,258)(33,028)
Amortization of prior service benefit20 21 61 68 
Total net pension benefits cost (credit)$1,513 $(4,374)$4,485 $(13,343)
Postretirement Benefits Cost:
Service cost$12 $21 $36 $64 
Interest cost467 327 1,404 980 
Total net postretirement benefits cost$479 $348 $1,440 $1,044 
Total net pension and postretirement benefits cost (credit)$1,992 $(4,026)$5,925 $(12,299)
All components of net benefit cost (credit), other than service cost, are included in Other income, net on the consolidated statements of income.
During the three-month and nine-month periods ended September 30, 2023, the Company made contributions of $3.6 million and $12.2 million, respectively, to its qualified and nonqualified pension plans and the U.S. postretirement benefit plan. During the three-month and nine-month periods ended September 30, 2022 the Company made contributions of $3.2 million and $10.9 million, respectively, to its qualified and nonqualified pension plans and the U.S. postretirement benefit plan.