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Assets Held for Sale and Discontinued Operations (Tables) | 6 Months Ended
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Jun. 30, 2022
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 six-month periods ended June 30, 2022 and 2021 were as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(Thousands of dollars) | 2022 |  | 2021 |  | 2022 |  | 2021
Revenues | $ | — |  |  | 246 |  |  | $ | 10 |  |  | 658 |
Costs and expenses |  |  |  |  |  |  |
Other costs and expenses (benefits) | 943 |  |  | 348 |  |  | 1,504 |  |  | 552 |
(Loss) income before taxes | (943) |  |  | (102) |  |  | (1,494) |  |  | 106 |
Income tax expense | — |  |  | — |  |  | — |  |  | — |
(Loss) income from discontinued operations | $ | (943) |  |  | (102) |  |  | $ | (1,494) |  |  | 106 |
Major Categories of Assets and Liabilities Reflected as Held for Sale |
(Thousands of dollars) | June 30, 2022 |  | December 31, 2021
Current assets |  |  |
Property, plant, and equipment, net | 15,561 |  |  | 15,453 |
Total current assets associated with assets held for sale | $ | 15,561 |  |  | 15,453 |

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- Definition Schedule Of Disposal Groups Including Discontinued Operations Income Statement Disclosures [Table Text Block] + References No definition available. + Details
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