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Note 2 - Cost of Sales
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Disclosure of cost of sales [text block]
2
 Cost of sales
 
    Year ended December 31,  
(all amounts in thousands of U.S. dollars)   2018     2017     2016  
             
Inventories at the beginning of the year    
2,368,304
      
1,563,889
      
1,843,467
  
                         
Plus: Charges of the year                        
Raw materials, energy, consumables and other    
3,400,396
      
2,794,503
      
1,528,532
  
Services and fees    
275,130
      
244,035
      
199,210
  
Labor cost    
855,040
      
778,408
      
658,975
  
Depreciation of property, plant and equipment    
432,497
      
383,490
      
376,965
  
Amortization of intangible assets    
8,220
      
18,621
      
27,244
  
Maintenance expenses    
185,782
      
183,370
      
122,553
  
Allowance for obsolescence    
25,457
      
(12,917
 )    
32,765
  
Taxes    
133,308
      
18,542
      
16,693
  
Other    
119,507
      
88,823
      
89,575
  
     
5,435,337
      
4,496,875
      
3,052,512
  
Less: Inventories at the end of the year (*)    
(2,524,341
 )    
(2,368,304
 )    
(1,593,708
 )
From discontinued operations    
-
      
(7,403
 )    
(136,587
 )
     
5,279,300
      
3,685,057
      
3,165,684
  
 
(*) Inventories as of
December 31, 2016
include $
29.8
million related to discontinued operations.