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Assets Held for Sale and Discontinued Operations (Tables) | 9 Months Ended
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Sep. 30, 2021
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, 2021 and 2020 were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(Thousands of dollars) | 2021 |  | 2020 |  | 2021 |  | 2020
Revenues | $ | 144 |  |  | — |  |  | $ | 801 |  |  | 4,074 |
Costs and expenses |  |  |  |  |  |  |
Other costs and expenses (benefits) | 850 |  |  | 778 |  |  | 1,401 |  |  | 10,981 |
(Loss) income before taxes | (706) |  |  | (778) |  |  | (600) |  |  | (6,907) |
Income tax expense | — |  |  | — |  |  | — |  |  | — |
(Loss) income from discontinued operations | $ | (706) |  |  | (778) |  |  | $ | (600) |  |  | (6,907) |
Major Categories of Assets and Liabilities Reflected as Held for Sale |
(Thousands of dollars) | September 30, 2021 |  | December 31, 2020
Current assets |  |  |
Cash | $ | — |  |  | 10,185 |
Inventories | — |  |  | 406 |
Property, plant, and equipment, net | 40,987 |  |  | 307,704 |
Deferred income taxes and other assets | — |  |  | 9,441 |
Total current assets associated with assets held for sale | $ | 40,987 |  |  | 327,736 |
Current liabilities |  |  |
Accounts payable | $ | — |  |  | 5,306 |
Other accrued liabilities | — |  |  | 45 |
Current maturities of long-term debt (finance lease) | — |  |  | 737 |
Taxes payable | — |  |  | 1,510 |
Long-term debt (finance lease) | — |  |  | 6,513 |
Asset retirement obligation | — |  |  | 261 |
Total current liabilities associated with assets held for sale | $ | — |  |  | 14,372 |

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