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Other Financial Information | 6 Months Ended
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Jun. 30, 2022
Other Financial Information [Abstract] |
Other Financial Information | Note G – Other Financial Information Additional disclosures regarding cash flow activities are provided below.
| Six Months Ended June 30,
(Thousands of dollars) | 2022 |  | 2021
Net decrease (increase) in operating working capital, excluding cash and cash equivalents: |  |  |
(Increase) in accounts receivable ¹ | $ | (263,104) |  |  | (104,775) |
(Increase) decrease in inventories | (10,092) |  |  | 8,938 |
(Increase) in prepaid expenses | (1,693) |  |  | (1,945) |
Increase in accounts payable and accrued liabilities ¹ | 147,790 |  |  | 124,699 |
Increase (decrease) in income taxes payable | 5,501 |  |  | (352) |
Net decrease (increase) in noncash operating working capital | $ | (121,598) |  |  | 26,565 |
Supplementary disclosures: |  |  |
Cash income taxes paid, net of refunds | $ | 1,783 |  |  | 1,474 |
Interest paid, net of amounts capitalized of $10.4 million in 2022 and $7.4 million in 2021 | 78,747 |  |  | 80,546 |
Non-cash investing activities: |  |  |
Asset retirement costs capitalized 2 | $ | 9,007 |  |  | 6,669 |
(Increase) decrease in capital expenditure accrual | (1,929) |  |  | 20,614 |
1 Excludes receivable/payable balances relating to mark-to-market of derivative instruments and contingent consideration relating to acquisitions. 2 2021 Excludes non-cash capitalized cost offset by Terra Nova impairment of $74.4 million.

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