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SHARE CAPITAL AND SHARE-BASED PAYMENTS - Narrative (Details) CAD / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 CAD CAD / shares | Dec. 31, 2016 CAD CAD / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CAD CAD / shares | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD 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 |  |  | 2.50% | 2.50% | 2.50% | 2.50%
Aggregate intrinsic value of vested share options | $ |  |  | $ 4,076 |  | $ 3,870 |
Weighted average fair value of stock options granted |  |  |  | CAD 5.97 |  | CAD 3.34
Weighted average share price at date of grant | CAD 12.50 | CAD 7.19 |  |  |  |
Weighted average share price at date of exercise of stock options (C$ per share) | CAD / shares | CAD 13.50 | CAD 15.53 |  |  |  |
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 |  |  |  | CAD 12.95 |  | CAD 10.13
Weighted average fair value (C$ per unit) | CAD / shares |  |  |  | CAD 11.07 |  | CAD 12.01
Liabilities from share-based payment transactions | $ |  |  | 5,372 |  | 4,791 |
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 |  |  |  | CAD 14.06 |  | CAD 7.27
Fair value of units settled (C$ per unit) | CAD / shares | CAD 13.98 | 8.09 |  |  |  |
Weighted average fair value (C$ per unit) | CAD / shares |  |  |  | CAD 11.07 |  | CAD 12.01
Liabilities from share-based payment transactions | $ |  |  | 3,339 |  | 3,561 |
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 |  |  |  | CAD 12.62 |  | CAD 7.17
Fair value of units settled (C$ per unit) | CAD / shares | CAD 13.97 | CAD 17.32 |  |  |  |
Weighted average fair value (C$ per unit) | CAD / shares |  |  |  | CAD 9.47 |  | CAD 12.29
Liabilities from share-based payment transactions | $ |  |  | $ 1,299 |  | $ 3,818 |
Vesting period | 3 years |  |  |  |  |
Minimum |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Exercise price, share options granted | CAD 12.01 | CAD 7.17 |  |  |  |
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 | CAD 14.12 | CAD 7.27 |  |  |  |
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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