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Other Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Other Financial Information [Abstract] |
Noncash Operating Working Capital (Increase) Decrease | Noncash operating working capital (increased) decreased during each of the three years ended December 31, 2019 as shown in the following table.
(Thousands of dollars) | 2019 |  | 2018 |  | 2017
Net (increase) decrease in operating working capital, excluding cash and cash equivalents: |  |  |  |  |
(Increase) decrease in accounts receivable ¹ | $ | (232,037 | ) |  | (30,212 | ) |  | (15,462 | )
(Increase) decrease in inventories | 10,258 |  |  | 16,794 |  |  | 15,429 |
(Increase) decrease in prepaid expenses | 4,650 |  |  | (10,011 | ) |  | 15,752 |
Increase (decrease) in accounts payable and accrued liabilities ¹ | 196,773 |  |  | 8,784 |  |  | 70,376 |
Increase (decrease) in income taxes payable | 3,469 |  |  | (1,458 | ) |  | (7,249 | )
Net (increase) decrease in noncash operating working capital | $ | (16,887 | ) |  | (16,103 | ) |  | 78,846 |
Supplementary disclosures: |  |  |  |  |
Cash income taxes paid, net of refunds | $ | (6,645 | ) |  | (7,603 | ) |  | (5,969 | )
Interest paid, net of amounts capitalized of $1.8 million in 2019 and $0.2 million in 2018 | 179,722 |  |  | 158,071 |  |  | 144,455 |
Non-cash investing activities: |  |  |  |  |
Asset retirement costs capitalized ² | $ | 33,874 |  |  | 346,387 |  |  | 126 |
(Increase) decrease in capital expenditure accrual | (73,426 | ) |  | 9,817 |  |  | 16,325 |
1 Excludes receivable/payable balances relating to mark-to-market of crude contracts. 2 Includes asset retirement obligations assumed as part of the LLOG acquisition of $37.3 million.

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- Definition Tabular disclosure of the net increase (decrease) in operating capital in the operating section of the statement of cash flows, represents the entire footnote disclosure that provides details regarding the net change during the reporting period of all assets and liabilities used in operating activities. + References No definition available. + Details
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