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17. INCOME TAXES (Details 4) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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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

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