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Other Financial Information (Tables) | 9 Months Ended
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Sep. 30, 2025
Other Financial Information [Abstract] |
Schedule of Noncash Operating Working Capital (Increase) Decrease | Supplemental Information to Statement of Cash Flows
| Nine Months Ended September 30,
(Thousands of dollars) | 2025 |  | 2024
Net (increase) decrease in operating working capital, excluding cash and cash equivalents: |  |  |
(Increase) decrease in accounts receivable | $ | (7,567) |  |  | $ | 80,603 |
(Increase) decrease in inventories | (9,532) |  |  | 1,823 |
(Increase) decrease in prepaid expenses | 15 |  |  | (8,131) |
Increase (decrease) in accounts payable and accrued liabilities | (5,373) |  |  | (43,231) |
Increase (decrease) in income taxes payable | 1,984 |  |  | 771 |
Net decrease (increase) in non-cash working capital | $ | (20,473) |  |  | $ | 31,835 |
Supplementary disclosures: |  |  |
Net cash income taxes paid | $ | 9,217 |  |  | $ | 12,519 |
Interest paid, net of amounts capitalized of $5.3 million in 2025 and $10.8 million in 2024 | 52,426 |  |  | 48,708 |
Non-cash investing activities: |  |  |
Asset retirement costs capitalized | $ | 21,756 |  |  | $ | 19,949 |
(Increase) decrease in capital expenditure accrual | 34,210 |  |  | (2,177) |

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- Definition Tabular disclosure of the net increase (decrease) in operating capital in the operating section of the statement of cash flows, represents the entire footnote disclosure that provides details regarding the net change during the reporting period of all assets and liabilities used in operating activities. + References No definition available. + Details
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