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17. INCOME TAXES (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items]    
Deferred income tax assets not recognized $ 83,469 $ 53,793
Investments    
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items]    
Deferred income tax assets not recognized 0 0
Property, plant and equipment, net    
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items]    
Deferred income tax assets not recognized 6,753 4,974
Tax losses – capital    
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items]    
Deferred income tax assets not recognized 53,217 27,544
Tax losses – operating    
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items]    
Deferred income tax assets not recognized 21,944 19,833
Tax credits    
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items]    
Deferred income tax assets not recognized 897 860
Other deductible temporary differences    
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items]    
Deferred income tax assets not recognized $ 658 $ 582