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Share-based payment arrangements - Additional information (Details) $ / shares in Units, $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
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Dec. 31, 2020 USD ($) shares tranche $ / shares | Dec. 31, 2019 CAD ($) shares $ / shares | Dec. 31, 2020 CAD ($) shares $ / shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Number of share options granted (in shares) | 1,156,744 | 2,387,256 |  |  |  |
Employee stock option plan |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Term of employee option plan | 5 years |  |  |  |  |
Number of tranches | tranche | 3 |  |  |  |  |
Vesting percentage on first anniversary | 33.33% |  |  |  |  |
Vesting percentage on second anniversary | 33.33% |  |  |  |  |
Vesting percentage on third anniversary | 33.33% |  |  |  |  |
Number of share options available to grant under the plan (in shares) | 3,898,038 | 3,748,454 |  |  |  |
Number of share purchase options available to grant (in shares) | 2,416,611 | 2,670,039 |  |  |  |
Weighted average exercise price of share purchase options vested and exercisable (in Cdn$ per share) | $ / shares |  | $ 21.87 | $ 14.45 |  |  |
Weighted average share price at date of options exercised (in Cdn$ per share) | $ / shares |  | $ 10.43 | $ 14.47 |  |  |
Weighted average fair value per stock option (in Cdn$ per share) | $ |  | $ 2.19 | $ 4.12 |  |  |
Restricted share unit plan |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Maximum number of shares reserved for issue under options |  |  | 5,000,000 | 5,000,000 |  |
Number of shares purchased on open market | 385,000 |  |  |  |  |
Payments for shares purchased on open market | $ | $ 3,550 |  |  |  |  |
Number of share purchased held in trust share-based payment arrangement (in shares) | 564,586 |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) | 149,552 |  |  |  |  |
Weighted average fair value per stock option (in Cdn$ per share) | $ |  |  | $ 12.90 |  |  |
Number of share purchase options vested and exercisable (in shares) |  | 29,111 | 44,748 | 44,748 | 29,111 |
Restricted Shares With Performance Criteria |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Term of employee option plan | 3 years |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) | 299,112 | 412,473 |  |  |  |
Weighted average exercise price of other equity instruments granted in share-based payment arrangement (in $Cdn per share) | $ / shares | $ 24.94 |  |  |  |  |
Number of shares outstanding |  | 457,498 | 689,967 | 689,967 | 457,498 | 152,927
Restricted Shares With Performance Criteria | Bottom of range |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Performance target award (range) | 0.00% |  |  |  |  |
Restricted Shares With Performance Criteria | Top of range |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Performance target award (range) | 200.00% |  |  |  |  |
Deferred Share Units Plans |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Number of shares outstanding |  | 362,433 | 289,360 | 289,360 | 362,433 |
Liabilities from share-based payment transactions | $ |  |  |  | $ 3,834 | $ 2,911 |
Performance share unit |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Maximum number of shares reserved for issue under options |  |  | 100,395 | 100,395 |  |
Number of share options granted in share-based payment arrangement (in shares) | 0 | 264,083 |  |  |  |
Number of shares outstanding |  | 610,885 | 525,605 | 525,605 | 610,885 | 484,899
Performance share unit | Bottom of range |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Performance target award (range) | 0.00% |  |  |  |  |
Performance share unit | Top of range |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Performance target award (range) | 200.00% |  |  |  |  |
Restricted share units with no performance criteria |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Vesting percentage on first anniversary | 33.33% |  |  |  |  |
Vesting percentage on second anniversary | 33.33% |  |  |  |  |
Vesting percentage on third anniversary | 33.33% |  |  |  |  |
Number of share options granted in share-based payment arrangement (in shares) | 149,552 | 391,092 |  |  |  |
Number of shares outstanding |  | 536,330 | 478,067 | 478,067 | 536,330 | 333,119

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