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5. Financial risk management (Details)
€ in Thousands, kr in Thousands, SFr in Thousands, $ in Thousands, $ in Thousands
Dec. 31, 2018
ARS ($)
$ / $
$ / €
$ / SFr
$ / kr
Dec. 31, 2018
USD ($)
$ / $
$ / €
$ / SFr
$ / kr
Dec. 31, 2018
EUR (€)
$ / $
$ / €
$ / SFr
$ / kr
Dec. 31, 2018
CHF (SFr)
$ / $
$ / €
$ / SFr
$ / kr
Dec. 31, 2018
NOK (kr)
$ / $
$ / €
$ / SFr
$ / kr
Dec. 31, 2017
ARS ($)
$ / $
Dec. 31, 2017
USD ($)
$ / $
Dec. 31, 2017
EUR (€)
$ / $
Dec. 31, 2017
CHF (SFr)
$ / $
Dec. 31, 2017
NOK (kr)
$ / $
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Exchange rate | $ / $ 37.70 37.70 37.70 37.70 37.70 18.65 18.65 18.65 18.65 18.65
Noncurrent Assets                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency $ 20,416                  
Foreign currency balance assets $ 765,600         $ 0        
Noncurrent Assets | Other receivables                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency   $ 20,416                
Exchange rate | $ / $ [1] 37.5 37.5 37.5 37.5 37.5          
Foreign currency balance assets   $ 765,600         $ 0      
Current Assets                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency $ 91,860                  
Foreign currency balance assets $ 3,444,751         1,836,794        
Current Assets | Other receivables                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency   $ 3,989                
Exchange rate | $ / $ [1] 37.5 37.5 37.5 37.5 37.5          
Foreign currency balance assets   $ 149,588         0      
Current Assets | Financial assets at fair value through profit or loss                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency   $ 87,621                
Exchange rate | $ / $ [1] 37.5 37.5 37.5 37.5 37.5          
Foreign currency balance assets   $ 3,285,788         1,829,881      
Current Assets | Cash and cash equivalents                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency   $ 250                
Exchange rate | $ / $ [1] 37.5 37.5 37.5 37.5 37.5          
Foreign currency balance assets   $ 9,375         6,519      
Current Assets | Cash and cash equivalents                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency | €     € 0              
Exchange rate | $ / € [1] 42.84 42.84 42.84 42.84 42.84          
Foreign currency balance assets | €     € 0              
Current Assets | Cash and cash equivalents                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Foreign currency balance assets | €               € 394    
Total Assets                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency $ 112,276                  
Foreign currency balance assets 4,210,351         1,836,794        
Non-current liabilities                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency 190,782                  
Foreign currency balance liabilities $ 7,192,467         6,189,294        
Non-current liabilities | Borrowings                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency   $ 190,782                
Exchange rate | $ / $ [1] 37.7 37.7 37.7 37.7 37.7          
Foreign currency balance liabilities   $ 7,192,467         6,189,294      
Current liabilities                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency $ 46,265                  
Foreign currency balance liabilities $ 1,742,222         516,575        
Current liabilities | Borrowings                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency   $ 28,580                
Exchange rate | $ / $ [1] 37.7 37.7 37.7 37.7 37.7          
Foreign currency balance liabilities   $ 1,077,453         105,139      
Current liabilities | Trade payables                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency   $ 17,519                
Exchange rate | $ / $ [1] 37.7 37.7 37.7 37.7 37.7          
Foreign currency balance liabilities   $ 660,459         $ 386,504      
Current liabilities | Trade payables                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency | €     € 93              
Exchange rate | $ / € [1] 43.163 43.163 43.163 43.163 43.163          
Foreign currency balance liabilities | €     € 4,014         € 9,248    
Current liabilities | Trade payables                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency | SFr       SFr 5            
Exchange rate | $ / SFr [1] 38.312 38.312 38.312 38.312 38.312          
Foreign currency balance liabilities | SFr       SFr 0         SFr 15,454  
Current liabilities | Trade payables                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency | kr         kr 68          
Exchange rate | $ / kr [1] 4.346 4.346 4.346 4.346 4.346          
Foreign currency balance liabilities | kr         kr 296         kr 230
Total Liabilities                    
SummaryOfFinancialRiskManagementLineItems [Line Items]                    
Amount of foreign currency $ 237,047                  
Foreign currency balance liabilities $ 8,934,689         $ 6,705,869        
[1] The exchange rates used are the BNA exchange rates in effect as of December 31, 2018 for US Dollars (U.S.$.), Euros (EUR), Swiss Francs (CHF) and Norwegian Krones (NOK).