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INCOME TAXES (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset $ 13,581 $ 16,934  
Deferred tax liability (2,807) (3,288)  
Total deferred income tax asset, net 10,774 13,646 $ 16,371
Share issue costs and other [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset 1,966 1,906  
Non-capital losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset 30,027 31,410  
Mineral, royalty and other interest [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset (18,412) (16,382)  
Deferred tax liability $ (2,807) $ (3,288)