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Inventories
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consisted of the following at December 31, 2019 and 2018.

December 31,
(Thousands of dollars)
2019
 
2018
Unsold crude oil
$
27,634

 
17,318

Materials and supplies
48,489

 
62,706

Inventories
$
76,123

 
80,024