Stock-based compensation - Restricted share unit plan (Details) - CAD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Performance restricted share units (PSUs)
Number of units
Beginning balance (in shares)	426,569	492,557
Granted (in shares)	116,775	112,079
Vested (in shares)	(111,630)	(178,067)
Ending balance (in shares)	431,714	426,569
Weighted-average exercise price $ per share
Outstanding, beginning of period (CAD per unit)	$ 12.06	$ 8.86
Granted, Weighted average exercise price (CAD per unit)	15.55	20.04
Vested, Weighted average exercise price (CAD per unit)	14.13	8.24
Outstanding, end of period (CAD per unit)	$ 12.47	$ 12.06
Vested (in shares)	111,630	178,067
Liability classified restricted share unit plan \| Restricted share units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition in years following grant	2 years
Award vesting period	3 years
Restricted share unit plan \| Restricted share units (RSUs)
Number of units
Beginning balance (in shares)	553,411	641,471
Granted (in shares)	167,631	144,383
Vested (in shares)	(169,689)	(220,116)
Forfeited (in shares)	(15,455)	(12,327)
Ending balance (in shares)	535,898	553,411
Weighted-average exercise price $ per share
Outstanding, beginning of period (CAD per unit)	$ 13.55	$ 10.34
Granted, Weighted average exercise price (CAD per unit)	15.55	19.97
Vested, Weighted average exercise price (CAD per unit)	14.13	8.44
Forfeited, Weighted average exercise price (CAD per unit)	13.41	13.01
Outstanding, end of period (CAD per unit)	$ 14.44	$ 13.55
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements	$ 3,479	$ 4,339
Period for award recognition	1 year 3 months 18 days	1 year 4 months 24 days
Vested (in shares)	169,689	220,116
Restricted share unit plan \| Performance restricted share units (PSUs)
Number of units
Vested (in shares)	(111,630)	(178,067)
Weighted-average exercise price $ per share
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements	$ 3,251	$ 3,702
Period for award recognition	1 year 3 months 18 days	1 year 6 months
Vested (in shares)	111,630	178,067

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Subsequent to Year of Grant

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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