v3.26.1
Other Financial Information (Tables)
 3 Months Ended
Mar. 31, 2026
Other Financial Information [Abstract]  
Schedule of Noncash Operating Working Capital (Increase) Decrease
Supplemental Information to Statement of Cash Flows
Three Months Ended
March 31,
(Thousands of dollars)20262025
Net (increase) decrease in operating working capital, excluding cash and cash equivalents:
(Increase) decrease in accounts receivable $(120,525)$(10,089)
(Increase) decrease in inventories(479)(15,851)
(Increase) decrease in prepaid expenses2,799 10,502 
Increase (decrease) in accounts payable and accrued liabilities 8,752 (13,560)
Increase (decrease) in income taxes payable1,481 6,214 
Net (increase) decrease in non-cash working capital$(107,972)$(22,784)
Supplementary disclosures:
Interest paid, net of amounts capitalized of $3.9 million in 2026 and $1.1 million in 2025
$4,897 $6,347 
Non-cash investing activities:
Asset retirement costs capitalized$8,843 $8,996 
(Increase) decrease in capital expenditure accrual(54,000)(42,442)