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Pension Plans and Other Postretirement Benefits
3 Months Ended
Mar. 31, 2024
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 periods ended March 31, 2024 and 2023 were as follows (in thousands):
Three Months Ended
March 31,
20242023
Pension Benefits Cost (Credit):
Service cost$1,566 $1,321 
Interest cost8,145 8,542 
Expected return on assets(8,830)(8,409)
Amortization of prior service benefit20 20 
Total net pension benefits cost$901 $1,474 
Postretirement Benefits Cost:
Service cost$12 $12 
Interest cost360 468 
Total net postretirement benefits cost$372 $480 
Total net pension and postretirement benefits cost$1,273 $1,954 
All components of net benefit cost, other than service cost, are included in Other income, net on the consolidated statements of income.
During the three-month periods ended March 31, 2024 and 2023, the Company made contributions of $4.8 million and $2.8 million, respectively, to its qualified and nonqualified pension plans and the U.S. postretirement benefit plan.