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FINANCIAL RISK MANAGEMENT - Disclosure of impact on earnings after tax and equity (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Schedule Of Interest Rate Sensitivity Analysis [Line Items] |  |
Fair value sensitivity for fixed-rate instruments | $ (1,982) | $ (2,095)
Senior secured notes [Member] |  |
Schedule Of Interest Rate Sensitivity Analysis [Line Items] |  |
Fair value sensitivity for fixed-rate instruments | (1,696) | (1,768)
Cash and cash equivalent [Member] |  |
Schedule Of Interest Rate Sensitivity Analysis [Line Items] |  |
Cash flow sensitivity for variable-rate instruments | 617 | 386
Lease liabilities [Member] |  |
Schedule Of Interest Rate Sensitivity Analysis [Line Items] |  |
Fair value sensitivity for fixed-rate instruments | (61) | (149)
Lease related obligations [Member] |  |
Schedule Of Interest Rate Sensitivity Analysis [Line Items] |  |
Fair value sensitivity for fixed-rate instruments | (83) | (44)
Secured equipment loans [Member] |  |
Schedule Of Interest Rate Sensitivity Analysis [Line Items] |  |
Fair value sensitivity for fixed-rate instruments | $ (142) | $ (134)

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