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Assets Held for Sale and Discontinued Operations (Tables)
 6 Months Ended
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)2022202120222021
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, net15,561 15,453 
Total current assets associated with assets held for sale$15,561 15,453