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CURRENT AND DEFERRED INCOME TAX - Tax Operating Losses (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax operating losses $ 466,873
Argentina  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax operating losses 399,680
Mexico  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax operating losses 53,064
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 6,877
U.S.A.  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax operating losses $ 7,181