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Pension And Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Jun. 30, 2023
Retirement Benefits [Abstract]  
Components of Company's Net Periodic Benefit Cost
The components of the Company’s net periodic benefit cost were as follows:
Pension BenefitsOther Postretirement Benefits
Three Months Ended June 30,Three Months Ended June 30,
(in thousands of dollars)2023202220232022
Service cost$1,282 $1,545 $25 $32 
Interest cost2,901 2,335 264 241 
Expected return on plan assets(3,888)(3,324)(16)(19)
Net amortization and deferral203 1,001 (189)(172)
Net periodic benefit cost
$498 $1,557 $84 $82