v3.8.0.1
INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory Table [Text Block]
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