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Other Financial Information | 3 Months Ended
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Mar. 31, 2022
Other Financial Information [Abstract] |
Other Financial Information | Note G – Other Financial Information Additional disclosures regarding cash flow activities are provided below.
| Three Months Ended March 31,
(Thousands of dollars) | 2022 |  | 2021
Net decrease (increase) in operating working capital, excluding cash and cash equivalents: |  |  |
(Increase) in accounts receivable ¹ | $ | (117,928) |  |  | (16,954) |
(Increase) decrease in inventories | (4,541) |  |  | 392 |
(Increase) in prepaid expenses | (515) |  |  | (3,652) |
Increase in accounts payable and accrued liabilities ¹ | 40,426 |  |  | 11,810 |
Increase (decrease) in income taxes payable | 1,636 |  |  | (648) |
Net (increase) in noncash operating working capital | $ | (80,922) |  |  | (9,052) |
Supplementary disclosures: |  |  |
Cash income taxes paid, net of refunds | $ | 103 |  |  | 720 |
Interest paid, net of amounts capitalized of $5.3 million in 2022 and $3.3 million in 2021 | 40,181 |  |  | 44,577 |
Non-cash investing activities: |  |  |
Asset retirement costs capitalized 2 | $ | 3,889 |  |  | 6,390 |
(Increase) decrease in capital expenditure accrual | (49,352) |  |  | 13,617 |
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 Terra Nova impairment of $74.4 million in the first quarter of 2021.

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