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Long-term debt (Narrative) (Details) $ in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2017 CAD ($) $ / shares | Dec. 31, 2016 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Accordion feature | $ 100,000 |  | $ 100,000 |  |  |
Revolving credit facility | 113,389 |  | 63,659 |  |  |
Convertible debenture | 300,000 |  | 350,000 |  |  |
Convertible debenture (2016) [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Convertible debenture |  |  |  |  |  | $ 50,000
Convertible debenture (2017) [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Convertible debenture |  |  |  |  | $ 300,000 |
Borrowings, interest rate |  |  |  |  | 4.00% |
Conversion price | $ / shares |  |  |  |  | 22.89 |
Convertible debenture (2017) [Member] | Public offering [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Convertible debenture |  |  |  |  | $ 184,000 |
Convertible debenture (2017) [Member] | Private placements offering [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Convertible debenture |  |  |  |  | $ 116,000 |
Revolving credit facility [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Increase in revolving credit facility available balance | 150,000 |  |  |  |  |
Revolving credit facility, available balance | 550,000 |  |  |  |  |
Accordion feature | 100,000 |  |  |  |  |
Revolving credit facility | $ 113,400 |  |  |  |  |
Revolving credit facility drawn during period |  | $ 50 | $ 63,400 | $ 50 |  |
Borrowings, interest rate | 2.25% |  |  |  |  |
Additional amount withdrawn to repay Investissement Quebec convertible debenture | $ 50,000 |  |  |  |  |
Revolving credit facility [Member] | Top of range [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Revolving credit facility, available balance | $ 650,000 |  |  |  |  |

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