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INVENTORIES
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
INVENTORIES
INVENTORIES
Inventories consisted of the following:
 
December 31,
 
2017
 
2016
 
(Thousands of Dollars)
Petroleum products
$
17,027

 
$
28,044

Materials and supplies
9,830

 
9,901

Total
$
26,857

 
$
37,945



We purchase petroleum products for resale. Our petroleum products consist of intermediates, gasoline, distillates and other petroleum products. Materials and supplies mainly consist of blending and additive chemicals and maintenance materials used in our pipeline and storage segments.