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Fair value of financial instruments - Disclosure of detailed information about fair value of long-term debt (Details) - CAD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of fair value measurement of assets [line items] |  |  |
Long-term debt | $ 349,042 | $ 352,769 | $ 464,308
Level 1 [Member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Long-term debt | 280,807 |  |
Level 2 [Member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Long-term debt | 68,235 |  |
Fair value [Member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Long-term debt | 371,825 |  |
Fair value [Member] | Level 1 [Member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Long-term debt | 303,240 |  |
Fair value [Member] | Level 2 [Member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Long-term debt | $ 68,585 |  |

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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