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CURRENT AND DEFERRED INCOME TAX - Tax Operating Losses (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax operating losses $ 72,734
Argentina  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax operating losses 17,324
Mexico  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax operating losses 41,601
Peru  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax operating losses 71
Canada  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax operating losses 4,256
U.S.A.  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax operating losses $ 9,482