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INCOME TAXES (Details 4) - CAD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items] |  |  |
Deferred income tax assets not recognized | $ 109,532 | $ 104,716 | $ 72,224
Property, plant and equipment, net |  |  |
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items] |  |  |
Deferred income tax assets not recognized | 10,439 | 8,472 | 6,678
Tax losses - capital |  |  |
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items] |  |  |
Deferred income tax assets not recognized | 66,527 | 66,763 | 36,981
Tax losses - operating |  |  |
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items] |  |  |
Deferred income tax assets not recognized | 29,220 | 27,530 | 26,628
Tax credits |  |  |
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items] |  |  |
Deferred income tax assets not recognized | 1,126 | 1,125 | 1,154
Other deductible temporary differences |  |  |
DisclosureOfDeferredIncomeTaxAssetsNotRecognisedLineItems [Line Items] |  |  |
Deferred income tax assets not recognized | $ 2,220 | $ 826 | $ 783

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