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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory Inventories consisted of the following at December 31, 2021 and 2020:
December 31,
(Thousands of dollars)
20212020
Unsold crude oil$15,497 16,399 
Materials and supplies38,701 49,677 
Inventories$54,198 66,076