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Stock-based compensation - Performance and deferred stock unit plan (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2021 $ / shares shares | Dec. 31, 2022 CAD ($) $ / shares shares | Dec. 31, 2021 CAD ($) $ / shares shares | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Current portion of DSU liabilities | $ |  | $ 5,099,000 | $ 0 |
Performance restricted share units (PSUs) |  |  |  |
Number of units |  |  |  |
Beginning balance (in shares) | 492,557 | 426,569 | 492,557 |
Granted (in shares) |  | 116,775 | 112,079 |
Vested/redeemed (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) | $ / shares | $ 8.86 | $ 12.06 | $ 8.86 |
Granted, Weighted average exercise price (CAD per unit) | $ / shares |  | 15.55 | 20.04 |
Vested/redeemed, Weighted average exercise price (CAD per unit) | $ / shares |  | 14.13 | 8.24 |
Outstanding, end of period (CAD per unit) | $ / shares |  | $ 12.47 | $ 12.06 |
Vested (in shares) |  | 111,630 | 178,067 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Risk-free interest rate |  | 3.14% | 0.65% |
Expected volatility |  | 48.70% | 50.96% |
Performance restricted share unit plan | Performance restricted share units (PSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance restricted share unit plan granted to the services to be provided |  | 2 years |  |
Award vesting period |  | 3 years |  |
Restricted share unit plan | Performance restricted share units (PSUs) |  |  |  |
Number of units |  |  |  |
Vested/redeemed (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 | $ |  | $ 3,251,000 | $ 3,702,000 |
Period for award recognition |  | 1 year 3 months 18 days | 1 year 6 months |
Vested (in shares) |  | 111,630 | 178,067 |
Settlement ratio, per PSU (in shares) |  | 1.14 | 2.0 |
Deferred stock unit plan | Deferred stock units (DSUs) |  |  |  |
Number of units |  |  |  |
Beginning balance (in shares) | 1,005,503 | 932,644 | 1,005,503 |
Granted (in shares) |  | 87,569 | 66,265 |
Vested/redeemed (in shares) |  | 0 | (139,124) |
Ending balance (in shares) |  | 1,020,213 | 932,644 |
Weighted-average exercise price $ per share |  |  |  |
Total unrecognized compensation costs related to non-vested non-option share-based payment arrangements | $ |  | $ 0 |  |
Vested (in shares) |  | 0 | 139,124 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Required annual fixed remuneration in form of DSUs if shareholding guidelines are met, percentage | 60.00% |  |  |
Percentage of annual bonus eligible for deferred stock units | 50.00% |  |  |
Fair market value (CAD per share) | $ / shares |  | $ 17.90 | $ 18.78 |
Award units settled during the period | $ |  | $ 0 | $ 2,300,000 |
Deferred stock unit plan | Deferred stock units (DSUs) | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Required annual fixed remuneration in form of DSUs, percentage |  |  |  | 50.00%
Required annual fixed remuneration in form of DSUs if shareholding guidelines are not met, percentage | 0.00% |  |  |
Deferred stock unit plan | Deferred stock units (DSUs) | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Required annual fixed remuneration in form of DSUs, percentage |  |  |  | 100.00%
Required annual fixed remuneration in form of DSUs if shareholding guidelines are not met, percentage | 100.00% |  |  |
Deferred stock unit plan | Deferred stock units (DSUs) | Accrued liabilities |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Current portion of DSU liabilities | $ |  | 5,099,000 | 0 |
Deferred stock unit plan | Deferred stock units (DSUs) | Other liabilities |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Non-current portion of award obligation | $ |  | $ 13,159,000 | $ 17,515,000 |

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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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