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Other Financial Information | 9 Months Ended
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Sep. 30, 2021
Other Financial Information [Abstract] |
Other Financial Information | Note G – Other Financial Information Additional disclosures regarding cash flow activities are provided below.
| Nine Months Ended September 30,
(Thousands of dollars) | 2021 |  | 2020
Net (increase) decrease in operating working capital, excluding cash and cash equivalents: |  |  |
Decrease in accounts receivable ¹ | $ | 75,100 |  |  | 251,706 |
Decrease in inventories | 9,718 |  |  | 4,747 |
(Increase) in prepaid expenses | (6,682) |  |  | (17,400) |
Increase (decrease) in accounts payable and accrued liabilities ¹ | 40,687 |  |  | (264,078) |
(Decrease) in income taxes payable | (1,493) |  |  | (1,236) |
Net (increase) decrease in noncash operating working capital | $ | 117,330 |  |  | (26,261) |
Supplementary disclosures: |  |  |
Cash income taxes paid, net of refunds | $ | 1,685 |  |  | (12,559) |
Interest paid, net of amounts capitalized of $11.6 million in 2021 and $5.9 million in 2020 | 127,793 |  |  | 139,651 |
Non-cash investing activities: |  |  |
Asset retirement costs capitalized ² | $ | 36,300 |  |  | 6,342 |
Decrease in capital expenditure accrual | 31,301 |  |  | 74,742 |
1 Excludes receivable/payable balances relating to mark-to-market of derivative instruments and contingent consideration relating to acquisitions. 2 Excludes non-cash capitalized cost offset by impairment of $74.4 million in the first quarter of 2021 and a gain in other operating income of $71.8 million following a commercial agreement to sanction an asset life extension project at Terra Nova in the third quarter of 2021, which extended the life of Terra Nova by approximately 10 years.

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