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Other Financial Information (Tables) | 6 Months Ended
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Jun. 30, 2023
Other Financial Information [Abstract] |
Noncash Operating Working Capital (Increase) Decrease | Additional disclosures regarding cash flow activities are provided below.
| Six Months Ended June 30,
(Thousands of dollars) | 2023 |  | 2022
Net (increase) decrease in operating working capital, excluding cash and cash equivalents: |  |  |
(Increase) in accounts receivable | $ | (18,915) |  |  | $ | (263,104) |
(Increase) decrease in inventories | (8,353) |  |  | (10,092) |
(Increase) decrease in prepaid expenses | 8,291 |  |  | (1,693) |
Increase in accounts payable and accrued liabilities ¹ | 6,642 |  |  | 147,790 |
Increase (decrease) in income taxes payable | (3,005) |  |  | 5,501 |
Net increase in noncash working capital | $ | (15,340) |  |  | $ | (121,598) |
Supplementary disclosures: |  |  |
Cash income taxes paid, net of refunds | $ | 10,904 |  |  | $ | 1,783 |
Interest paid, net of amounts capitalized of $6.8 million in 2023 and $10.4 million in 2022 | 54,305 |  |  | 78,747 |
Non-cash investing activities: |  |  |
Asset retirement costs capitalized | $ | 2,742 |  |  | $ | 9,007 |
(Increase) decrease in capital expenditure accrual | 20,522 |  |  | (1,929) |
1 Excludes payable balances relating to mark-to-market of derivative instruments and contingent consideration relating to acquisitions.

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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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