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PLANT, PIPELINE AND EQUIPMENT (Tables)
12 Months Ended
Dec. 31, 2015
PLANT, PIPELINE AND EQUIPMENT [Abstract]  
Plant, Pipeline and Equipment
Plant, pipeline and equipment include the following at December 31:

  
2015
  
2014
 
  
(thousands of dollars)
 
Platinum catalyst
 
$
1,612
  
$
1,612
 
Land
  
4,577
   
4,577
 
Plant, pipeline and equipment
  
128,302
   
95,351
 
Construction in progress
  
8,980
   
11,590
 
Total plant, pipeline and equipment
  
143,471
   
113,130
 
    Less accumulated depreciation
  
(46,564
)
  
(39,319
)
Net plant, pipeline and equipment
 
$
96,907
  
$
73,811