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INVESTMENTS (Details) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
DisclosureOfInvestmentsLineItems [Line Items]      
Current investments $ 0 $ 0 $ 37,807
Noncurrent investments 12,104 2,255 7,359
Total investments 12,104 2,255 45,166
Equity instruments-fair value through profit and loss      
DisclosureOfInvestmentsLineItems [Line Items]      
Total investments 12,104 2,255 7,359
Debt instruments-fair value through profit and loss      
DisclosureOfInvestmentsLineItems [Line Items]      
Total investments $ 0 $ 0 $ 37,807