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Other Financial Information | 12 Months Ended
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Dec. 31, 2019
Other Financial Information [Abstract] |
Other Financial Information | 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 $(6.0) million in 2019, $16.1 million in 2018 and $(82.7) million in 2017. 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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