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Shares - Share purchase program (Details) - CAD ($) $ in Thousands		12 Months Ended
	Apr. 09, 2021	Dec. 31, 2022	Dec. 31, 2021	Apr. 11, 2022
Equity, Class of Treasury Stock [Line Items]
Shares purchased and subsequently cancelled during period (in shares)		2,195,646	1,113,903
2022 NCIB
Equity, Class of Treasury Stock [Line Items]
Maximum number of shares to be purchased (in shares)				2,113,054
Common shares
Equity, Class of Treasury Stock [Line Items]
Shares purchased and subsequently cancelled during period (in shares)		2,195,646	1,113,903
Common shares | 2022 NCIB
Equity, Class of Treasury Stock [Line Items]
Shares purchased and subsequently cancelled during period (in shares)		2,113,054
Increase (decrease) as a result of the retirement of shares		$ 16,824
Common shares | 2021 NCIB
Equity, Class of Treasury Stock [Line Items]
Shares purchased and subsequently cancelled during period (in shares)	82,592
Increase (decrease) as a result of the retirement of shares	$ 665
Additional paid-in capital | 2022 NCIB
Equity, Class of Treasury Stock [Line Items]
Increase (decrease) as a result of the retirement of shares		$ 15,827
Additional paid-in capital | 2021 NCIB
Equity, Class of Treasury Stock [Line Items]
Increase (decrease) as a result of the retirement of shares	$ 816

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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