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Other Financial Information (Tables) | 3 Months Ended
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Mar. 31, 2021
Other Financial Information [Abstract] |
Noncash Operating Working Capital (Increase) Decrease | Additional disclosures regarding cash flow activities are provided below.
| Three Months Ended March 31,
(Thousands of dollars) | 2021 |  | 2020
Net (increase) decrease in operating working capital, excluding cash and cash equivalents: |  |  |
(Increase) decrease in accounts receivable ¹ | $ | (16,954) |  |  | 186,436 |
Decrease in inventories | 392 |  |  | 7,553 |
(Increase) in prepaid expenses | (3,652) |  |  | (10,179) |
Increase (decrease) in accounts payable and accrued liabilities ¹ | 11,810 |  |  | (76,287) |
Increase (decrease) in income taxes payable | (648) |  |  | 304 |
Net (increase) decrease in noncash operating working capital | $ | (9,052) |  |  | 107,827 |
Supplementary disclosures: |  |  |
Cash income taxes paid, net of refunds | $ | 720 |  |  | 72 |
Interest paid, net of amounts capitalized of $3.3 million in 2021 and $2.4 million in 2020 | 44,577 |  |  | 42,344 |
Non-cash investing activities: |  |  |
Asset retirement costs capitalized ² | $ | 6,390 |  |  | 280 |
Decrease in capital expenditure accrual | 13,617 |  |  | 10,633 |
1 Excludes receivable/payable balances relating to mark-to-market of crude contracts and contingent consideration relating to acquisitions. 2 Excludes non-cash capitalized cost offset by impairment of $74.4 million in 2021.

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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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