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INCOME TAXES (Details 4) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items]      
Deferred income tax assets not recognized $ 112,728 $ 109,532 $ 104,716
Property, plant and equipment, net      
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items]      
Deferred income tax assets not recognized 7,344 10,439 8,472
Tax losses - capital      
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items]      
Deferred income tax assets not recognized 66,783 66,527 66,763
Tax losses - operating      
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items]      
Deferred income tax assets not recognized 35,904 29,220 27,530
Tax credits      
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items]      
Deferred income tax assets not recognized 1,126 1,126 1,125
Other deductible temporary differences      
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items]      
Deferred income tax assets not recognized $ 1,571 $ 2,220 $ 826