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Other Financial Information | 9 Months Ended
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Sep. 30, 2025
Other Financial Information [Abstract] |
Other Financial Information | Note F – Other Financial Information 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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