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Other Financial Information | 12 Months Ended
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Dec. 31, 2020
Other Financial Information [Abstract] |
Other Financial Information | Note O – Other Financial Information GAIN FROM FOREIGN CURRENCY TRANSACTIONS – Net gains (losses) from foreign currency transactions, including the effects of foreign currency contracts, included in the Consolidated Statements of Operations were $(0.9) million in 2020, $(6.0) million in 2019 and $16.1 million in 2018. Noncash operating working capital (increased) decreased during each of the three years ended December 31, 2020 as shown in the following table.
(Thousands of dollars) | 2020 |  | 2019 |  | 2018
Net (increase) decrease in operating working capital, excluding cash and cash equivalents: |  |  |  |  |
(Increase) decrease in accounts receivable ¹ | $ | 164,613 |  |  | (232,037) |  |  | (30,212) |
(Increase) decrease in inventories | 5,953 |  |  | 10,258 |  |  | 16,794 |
(Increase) decrease in prepaid expenses | 7,178 |  |  | 4,650 |  |  | (10,011) |
Increase (decrease) in accounts payable and accrued liabilities ¹ | (208,740) |  |  | 196,773 |  |  | 8,784 |
Increase (decrease) in income taxes payable | (1,031) |  |  | 3,469 |  |  | (1,458) |
Net (increase) decrease in noncash operating working capital | $ | (32,027) |  |  | (16,887) |  |  | (16,103) |
Supplementary disclosures: |  |  |  |  |
Cash income taxes paid, net of refunds | $ | (44,715) |  |  | (6,645) |  |  | (7,603) |
Interest paid, net of amounts capitalized of $8.0 million in 2020, $1.8 million in 2019 and $0.2 million in 2018 | 191,561 |  |  | 179,722 |  |  | 158,071 |
Non-cash investing activities: |  |  |  |  |
Asset retirement costs capitalized | $ | 14,736 |  |  | 33,874 |  |  | 346,387 |
(Increase) decrease in capital expenditure accrual | 84,645 |  |  | (73,426) |  |  | 9,817 |
1 Excludes receivable/payable balances relating to mark-to-market of crude contracts.

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