Other Financial Information (Tables)

3 Months Ended

Mar. 31, 2025

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)	2025		2024
Net (increase) decrease in operating working capital, excluding cash and cash equivalents:
(Increase) decrease in accounts receivable	$	(10,089)	$	(13,174)
(Increase) decrease in inventories	(15,851)		4,860
(Increase) decrease in prepaid expenses	10,502		5,110
Increase (decrease) in accounts payable and accrued liabilities	(13,560)		(24,852)
Increase (decrease) in income taxes payable	6,214		3,703
Net (increase) in non-cash working capital	$	(22,784)	$	(24,353)
Supplementary disclosures:
Net cash income taxes (refunded) paid	$	(1,632)	$	405
Interest paid, net of amounts capitalized of $1.1 million in 2025 and $3.9 million in 2024	6,347		11,062
Non-cash investing activities:
Asset retirement costs capitalized	$	8,996	$	10,955
(Increase) decrease in capital expenditure accrual	(42,442)		(12,948)