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INCOME TAXES (Details 4) - CAD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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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

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