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DEBT - Disclosure of borrowings (Details) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Current borrowings and current portion of non-current borrowings [abstract] |  |  |
Current portion of non-current borrowings | $ 17,617 | $ 16,460 |
Non-current portion of non-current borrowings, by type [abstract] |  |  |
Non-current portion of non-current borrowings | 345,787 | 357,025 |
Total debt | 363,404 | 373,485 | $ 355,481
Senior secured notes [Member] |  |  |
Non-current portion of non-current borrowings, by type [abstract] |  |  |
Non-current portion of non-current borrowings | 313,965 | 317,728 |
Lease liabilities [Member] |  |  |
Current borrowings and current portion of non-current borrowings [abstract] |  |  |
Current portion of non-current borrowings | 8,094 | 7,990 |
Non-current portion of non-current borrowings, by type [abstract] |  |  |
Non-current portion of non-current borrowings | 11,829 | 11,107 |
Secured equipment loans [Member] |  |  |
Current borrowings and current portion of non-current borrowings [abstract] |  |  |
Current portion of non-current borrowings | 7,536 | 6,626 |
Non-current portion of non-current borrowings, by type [abstract] |  |  |
Non-current portion of non-current borrowings | 12,536 | 18,746 |
Lease related obligations [Member] |  |  |
Current borrowings and current portion of non-current borrowings [abstract] |  |  |
Current portion of non-current borrowings | 1,987 | 1,844 |
Non-current portion of non-current borrowings, by type [abstract] |  |  |
Non-current portion of non-current borrowings | $ 7,457 | $ 9,444 |

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- Definition The current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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