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SHARE CAPITAL AND SHARE-BASED PAYMENTS - Narrative (Details) $ / shares in Units, $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) $ / shares $ / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2020 CAD ($) $ / shares | Dec. 31, 2019 CAD ($) $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Maximum percentage of options authorized to be issued through incentive plan | 6.50% |  |  |  |
Maximum term options granted | 7 years |  |  |  |
Percentage of incentive stock options to issued and outstanding common share capital | 0.60% | 1.50% | 1.50% | 0.60% | 1.50%
Aggregate intrinsic value of vested share options | $ 9,300 | $ 17,800 | $ 17,800 |  |
Weighted average fair value of stock options granted (C$ per share) |  |  |  | $ 8.32 | $ 6.22
Weighted average share price at date of exercise of stock options (C$ per share) | $ / shares | $ 26.03 |  | $ 18.37 |  |
Current liabilities from share-based payment transactions | $ 30,050 | 19,538 | $ 19,538 |  |
Transfer of equity-settled PSUs |  | 1,356 |  |  |
Stock options |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting period | 3 years |  |  |  |
Deferred Share Units |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Percentage of other equity instruments automatically redeemed by director | 50.00% |  |  |  |
Other equity instruments automatically redeemed, eligible director ceases to be a director, following period | 3 months |  |  |  |
Other equity instruments automatically redeemed, eligible director ceases to be a director, earlier of and following period | 15 months |  |  |  |
Weighted average fair value at grant date (C$ per unit) |  |  |  | $ 26.03 | $ 17.90
Weighted average fair value, replacement units (C$ per unit) | $ / shares | $ 29.63 |  |  |  |
Weighted average fair value (C$ per unit) | $ / shares |  |  |  | $ 25.56 | $ 24.99
Liabilities from share-based payment transactions | $ 15,000 | 11,800 | $ 11,800 |  |
Restricted Share Units |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting period | 3 years |  |  |  |
Weighted average fair value at grant date (C$ per unit) |  |  |  | $ 29.34 | $ 18.14
Weighted average fair value, replacement units (C$ per unit) | $ / shares | $ 29.29 |  |  |  |
Weighted average fair value (C$ per unit) | $ / shares |  |  |  | $ 25.56 | $ 24.99
Liabilities from share-based payment transactions | $ 6,500 |  |  |  |
Fair value of units settled (C$ per unit) | $ / shares | $ 26.02 |  | $ 17.67 |  |
Current liabilities from share-based payment transactions | $ 2,300 |  |  |  |
Liabilities from share-based payment transactions, equity reserve | $ 500 | 4,000 | $ 4,000 |  |
Performance Share Units |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting period | 3 years |  |  |  |
Weighted average fair value at grant date (C$ per unit) |  |  |  | $ 21.83 | $ 15.22
Weighted average fair value, replacement units (C$ per unit) | $ / shares | $ 42.14 |  |  |  |
Weighted average fair value (C$ per unit) | $ / shares |  |  |  | $ 27.14 | $ 39.60
Liabilities from share-based payment transactions | $ 7,800 | 3,700 | $ 3,700 |  |
Fair value of units settled (C$ per unit) | $ / shares | $ 27.33 |  | $ 23.43 |  |
Current liabilities from share-based payment transactions | $ 12,800 |  |  |  |
Liabilities from share-based payment transactions, equity reserve | $ 1,300 | 3,600 | $ 3,600 |  |
Transfer of equity-settled PSUs |  | 1,800 |  |  |
Transfer of equity settled, PSU, net |  | 1,300 |  |  |
Transfer of equity settled, PSU, reclassification |  | $ 400 | $ 400 |  |
Minimum |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Exercise price, share options granted (C$ per share) | $ / shares | $ 24.99 |  | $ 16.50 |  |
Minimum | Performance Share Units |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting rights, percentage | 0.00% |  |  |  |
Maximum |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Exercise price, share options granted (C$ per share) | $ / shares | $ 29.09 |  | $ 17.63 |  |
Maximum | Stock options |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting period | 7 years |  |  |  |
Maximum | Performance Share Units |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting rights, percentage | 200.00% |  |  |  |

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