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FINANCIAL RISK MANAGEMENT (Assumed financial exposure to currency risk) (Details) - Dec. 31, 2017 - Currency risk
$ in Thousands, $ in Millions
USD ($)
ARS ($)
United States of America, Dollars    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 0  
United States of America, Dollars | United States of America, Dollars    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0  
United States of America, Dollars | Euro Member Countries, Euro    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0  
United States of America, Dollars | Argentina, Pesos    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0  
United States of America, Dollars | Mexico, Pesos    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0  
United States of America, Dollars | Brazil, Brazil Real    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0  
United States of America, Dollars | Colombia, Pesos    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0  
Argentina, Pesos    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0  
Argentina, Pesos | United States of America, Dollars    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   $ 0
Argentina, Pesos | Euro Member Countries, Euro    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   0
Argentina, Pesos | Argentina, Pesos    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0  
Argentina, Pesos | Mexico, Pesos    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 0  
Argentina, Pesos | Brazil, Brazil Real    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic   $ 0
Argentina, Pesos | Colombia, Pesos    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 0