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INCOME TAXES (Deductible Unused Tax Losses) (Details) - CANADA
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Non-capital loss carry-forwards $ 111,212
Bottom of range [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiry date non capital loss carryforwards 2030
Top of range [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiry date non capital loss carryforwards 2036