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17. INCOME TAXES (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfDeferredIncomeTaxLiabilitiesLineItems [Line Items]    
Deferred income tax liability, beginning $ 15,021 $ 16,465
Recognized in income (loss) 3,638 3,955
Deferred income tax liability, ending 14,182 15,021
Deferred income tax liability    
DisclosureOfDeferredIncomeTaxLiabilitiesLineItems [Line Items]    
Deferred income tax liability, beginning (15,021) (16,465)
Recognized in income (loss) 3,638 3,955
Recognized in comprehensive income (loss) 0 (152)
Recognized in other liabilities (flow-through shares) (1,828) (1,836)
Other, including foreign exchange gain (loss) (971) (523)
Deferred income tax liability, ending $ (14,182) $ (15,021)