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SHARE CAPITAL AND SHARE-BASED PAYMENTS - Narrative (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 CAD ($) $ / shares | Dec. 31, 2017 CAD ($) $ / shares | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($) $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CAD ($) $ / 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 |  |  | 2.20% | 2.20% | 2.50% | 2.50%
Aggregate intrinsic value of vested share options |  |  | $ 11,898 |  | $ 4,076 |
Weighted average fair value of stock options granted |  |  |  | $ 5.06 |  | $ 5.97
Weighted average share price at date of grant | $ 11.84 | $ 12.50 |  |  |  |
Weighted average share price at date of exercise of stock options (C$ per share) | $ / shares | $ 14.13 | $ 13.50 |  |  |  |
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] |  |  |  |  |  |
Weighted average fair value at measurement date, other equity instruments granted |  |  |  | $ 12.49 |  | $ 12.95
Weighted average fair value (C$ per unit) | $ / shares |  |  |  | $ 16.50 |  | $ 11.07
Liabilities from share-based payment transactions |  |  | 6,455 |  | 5,372 |
Restricted Share Units |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Weighted average fair value at measurement date, other equity instruments granted |  |  |  | $ 11.47 |  | $ 14.06
Fair value of units settled (C$ per unit) | $ / shares | $ 12.33 | 13.98 |  |  |  |
Weighted average fair value (C$ per unit) | $ / shares |  |  |  | $ 16.50 |  | $ 11.07
Liabilities from share-based payment transactions |  |  | 2,949 |  | 3,339 |
Performance Share Units |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Weighted average fair value at measurement date, other equity instruments granted |  |  |  | $ 10.72 |  | $ 12.62
Fair value of units settled (C$ per unit) | $ / shares | $ 23.09 | $ 13.97 |  |  |  |
Weighted average fair value (C$ per unit) | $ / shares |  |  |  | $ 26.76 |  | $ 9.47
Liabilities from share-based payment transactions |  |  | $ 7,230 |  | $ 1,299 |
Vesting period | 3 years |  |  |  |  |
Minimum |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Exercise price, share options granted | $ 11.07 | $ 12.01 |  |  |  |
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] |  |  |  |  |  |
Maximum term options granted | 10 years |  |  |  |  |
Exercise price, share options granted | $ 13.39 | $ 14.12 |  |  |  |
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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