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INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2015
Inventory Disclosure [Abstract]  
Schedule of Inventory Table [Text Block]
Inventories consisted of the following:
 
December 31,
 
2015
 
2014
 
(Thousands of Dollars)
Crude oil and refined petroleum products
$
30,154

 
$
46,733

Materials and supplies
8,595

 
8,980

Total
$
38,749

 
$
55,713