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Other Financial Information | 9 Months Ended
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Sep. 30, 2020
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) | 2020 |  | 2019
Net (increase) decrease in operating working capital, excluding cash and cash equivalents: |  |  |
(Increase) decrease in accounts receivable ¹ | $ | 251,706 |  |  | (128,698) |
Decrease in inventories | 4,747 |  |  | 4,398 |
(Increase) in prepaid expenses | (17,400) |  |  | (3,745) |
Increase (decrease) in accounts payable and accrued liabilities ¹ | (264,078) |  |  | 165,224 |
Increase (decrease) in income taxes payable | (1,236) |  |  | 3,078 |
Net (increase) decrease in noncash operating working capital | $ | (26,261) |  |  | 40,257 |
Supplementary disclosures: |  |  |
Cash income taxes paid, net of refunds | $ | (12,559) |  |  | (4,563) |
Interest paid, net of amounts capitalized of $5.9 million in 2020 and $0.2 million in 2019 | 139,651 |  |  | 137,116 |
Non-cash investing activities: |  |  |
Asset retirement costs capitalized ² | $ | 6,342 |  |  | 48,203 |
(Increase) decrease in capital expenditure accrual | 74,742 |  |  | (52,659) |
1 Excludes receivable/payable balances relating to mark-to-market of crude contracts and contingent consideration relating to acquisitions. 2 2019 includes asset retirement obligations assumed as part of the LLOG acquisition of $37.3 million. See Note P.

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