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Discontinued Operations and Assets Held for Sale (Tables) | 9 Months Ended
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Sep. 30, 2020
Discontinued Operations and Disposal Groups [Abstract] |
Results of Operations Associated with Discontinued Operations | The results of operations associated with discontinued operations for the three-month and nine-month periods ended September 30, 2020 and 2019 were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(Thousands of dollars) | 2020 |  | 2019 |  | 2020 |  | 2019
Revenues | $ | — |  |  | 972,737 |  |  | 4,074 |  |  | 1,328,110 |
Costs and expenses |  |  |  |  |  |  |
Lease operating expenses | — |  |  | 6,262 |  |  | — |  |  | 127,138 |
Depreciation, depletion and amortization | — |  |  | (1) |  |  | — |  |  | 33,697 |
Other costs and expenses | 778 |  |  | 11,079 |  |  | 10,981 |  |  | 81,560 |
(Loss) income before taxes | (778) |  |  | 955,397 |  |  | (6,907) |  |  | 1,085,715 |
Income tax expense | — |  |  | 2,029 |  |  | — |  |  | 58,083 |
(Loss) income from discontinued operations | $ | (778) |  |  | 953,368 |  |  | (6,907) |  |  | 1,027,632 |
Major Categories of Assets and Liabilities Reflected as Held for Sale | The following table presents the carrying value of the major categories of assets and liabilities of the Brunei exploration and production operations, the U.K. refining and marketing operations and the Company’s office building in El Dorado, Arkansas and two airplanes that are reflected as held for sale on the Company’s Consolidated Balance Sheets. Subsequent to period end, one of the planes has been sold.
(Thousands of dollars) | September 30, 2020 |  | December 31, 2019
Current assets |  |  |
Cash | $ | 29,420 |  |  | 25,185 |
Accounts receivable | 425 |  |  | 4,834 |
Inventories | 406 |  |  | 406 |
Prepaid expenses and other | 831 |  |  | 1,882 |
Property, plant, and equipment, net | 68,393 |  |  | 82,116 |
Deferred income taxes and other assets | 9,441 |  |  | 9,441 |
Total current assets associated with assets held for sale | $ | 108,916 |  |  | 123,864 |
Current liabilities |  |  |
Accounts payable | $ | 5,481 |  |  | 3,702 |
Current maturities of long-term debt (finance lease) | 728 |  |  | 705 |
Taxes payable | 1,510 |  |  | 1,411 |
Long-term debt (finance lease) | 6,702 |  |  | 7,240 |
Asset retirement obligation | 256 |  |  | 240 |
Total current liabilities associated with assets held for sale | $ | 14,677 |  |  | 13,298 |

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