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Note 29 - Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of transactions between related parties [text block]
(all amounts in thousands of U.S. dollars)   Year ended December 31,
    2017   2016   2015
(i) Transactions                        
(a) Sales of goods and services                        
Sales of goods to non-consolidated parties    
32,362
      
21,174
      
24,019
  
Sales of goods to other related parties    
94,624
      
32,613
      
87,663
  
Sales of services to non-consolidated parties    
11,637
      
9,542
      
10,154
  
Sales of services to other related parties    
3,751
      
2,948
      
4,010
  
     
142,374
      
66,277
      
125,846
  
(b) Purchases of goods and services                        
Purchases of goods to non-consolidated parties    
234,361
      
67,048
      
260,280
  
Purchases of goods to other related parties    
17,711
      
20,150
      
35,153
  
Purchases of services to non-consolidated parties    
12,077
      
11,528
      
16,153
  
Purchases of services to other related parties    
50,794
      
53,530
      
78,805
  
     
314,943
      
152,256
      
390,391
  
(all amounts in thousands of U.S. dollars)   At December 31,
    2017   2016
(ii) Period-end balances                
(a) Arising from sales / purchases of goods / services                
Receivables from non-consolidated parties    
117,853
      
117,187
  
Receivables from other related parties    
50,815
      
13,357
  
Payables to non-consolidated parties    
(49,354
 )    
(21,314
 )
Payables to other related parties    
(14,475
 )    
(12,708
 )
     
104,839
      
96,522