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Other Financial Information | 3 Months Ended
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Mar. 31, 2020
Other Financial Information [Abstract] |
Other Financial Information | Other Financial Information Additional disclosures regarding cash flow activities are provided below.໿
| Three Months Ended March 31,
(Thousands of dollars) | 2020 |  | 2019
Net (increase) decrease in operating working capital, excluding cash and cash equivalents: |  |  |
(Increase) decrease in accounts receivable ¹ | $ | 186,436 |  |  | (112,673 | )
(Increase) decrease in inventories | 7,553 |  |  | 3,930 |
(Increase) decrease in prepaid expenses | (10,179 | ) |  | (10,763 | )
Increase (decrease) in accounts payable and accrued liabilities ¹ | (76,287 | ) |  | 21,131 |
Increase (decrease) in income taxes payable | 304 |  |  | (130 | )
Net (increase) decrease in noncash operating working capital | $ | 107,827 |  |  | (98,505 | )
Supplementary disclosures: |  |  |
Cash income taxes paid, net of refunds | $ | 72 |  |  | — |
Interest paid, net of amounts capitalized of $2.4 million in 2020 and $0 million in 2019 | 42,344 |  |  | 39,024 |
Non-cash investing activities: |  |  |
Asset retirement costs capitalized | $ | 280 |  |  | 486 |
(Increase) decrease in capital expenditure accrual | 10,633 |  |  | (63,328 | )
1 Excludes receivable/payable balances relating to mark-to-market of crude contracts and contingent consideration relating to acquisitions.

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- Definition The entire disclosures of supplemental information, including descriptions and amounts, related to the balance sheet, income statement, and/or cash flow statement. + References No definition available. + Details
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