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Income taxes - Disclosure of reconciliation of statutory weighted average tax rate applicable to income (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Income taxes [Abstract] |  |
(Loss) income before income taxes | $ (43,720) | $ 27,142
Income tax provision calculated using the combined Canadian federal and provincial statutory income tax rate | (11,586) | 7,193
Increase (decrease) in income taxes resulting from: |  |
Non-deductible expenses, net | 908 | (11)
(Non-deductible) non-taxable portion of capital losses, net | (761) | (1,893)
Differences in foreign statutory tax rates | (3,898) | (408)
Changed in unrecognized deferred tax assets | 20,050 | 6,570
Foreign withholding taxes | 864 | 778
Deferred premium on flow-through shares | (1,847) | 0
Effect of flow-through shares renunciation | 8,021 | 0
Tax rate changes of deferred income taxes | 0 | 11
Other | 1,204 | (1,327)
Total income tax expense | $ 12,955 | $ 10,913

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