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Pension Plans and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2022
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, 2022 and 2021 were as follows (in thousands):
Three Months Ended
March 31,
20222021
Pension Benefits Cost (Credit):
Service cost$985 $1,179 
Interest cost5,605 5,119 
Expected return on assets(11,212)(10,893)
Amortization of prior service benefit24 29 
Total net pension benefits credit$(4,598)$(4,566)
Postretirement Benefits Cost:
Service cost$21 $31 
Interest cost327 309 
Total net postretirement benefits cost$348 $340 
Total net pension and postretirement benefits credit$(4,250)$(4,226)
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 periods ended March 31, 2022 and 2021, we made contributions of $3.2 million and $14.7 million, respectively, to our qualified and nonqualified pension plans.
We paid $0.6 million and $0.6 million in premiums to the U.S. postretirement benefit plan during the three-month periods ended March 31, 2022 and 2021, respectively.