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Employee and Retiree Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Expense
The table that follows provides the components of net periodic benefit expense for the three-month and nine-month periods ended September 30, 2024 and 2023.
Three Months Ended September 30,
Pension BenefitsOther Postretirement Benefits
(Thousands of dollars)2024202320242023
Service cost$1,706 $1,650 $135 $132 
Interest cost8,398 8,534 782 874 
Expected return on plan assets(8,366)(8,223) – 
Estimated defined contribution provision54 53  – 
Amortization of prior service cost (credit)579 155 (133)(133)
Recognized actuarial loss (gain)2,363 2,407 (812)(767)
Total net periodic benefit expense$4,734 $4,576 $(28)$106 
Nine Months Ended September 30,
Pension BenefitsOther Postretirement Benefits
(Thousands of dollars)2024202320242023
Service cost$5,118 $4,950 $405 $396 
Interest cost25,182 25,605 2,346 2,622 
Expected return on plan assets(25,082)(24,671) – 
Estimated defined contribution provision163 161  – 
Amortization of prior service cost (credit)1,737 465 (399)(399)
Recognized actuarial loss (gain)7,084 7,222 (2,436)(2,315)
         Total net periodic benefit expense$14,202 $13,732 $(84)$304