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SHARE CAPITAL AND RESERVES (Narrative) (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2017 CAD ($) yr shares $ / shares | Dec. 31, 2017 USD ($) yr $ / shares shares | Dec. 31, 2016 CAD ($) yr shares $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Treasury shares authorized to purchase |  | 7,597,730 |
Cancellation of treasury shares | 4,106,772 |  |
Maximum percentage share compensation arrangements relative to outstanding shares | 8.50% |  |
Average share price of entity | $ / shares | $ 5.55 |  | $ 5.55
Stock Option Incentive Plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Granted, options | 795,000 |  | 1,336,000
Granted, options, weighted average exercise price | $ | $ 5.50 |  | $ 4.96
Fair value of options issued | $ |  | $ 1.1 |
Fair value of option issued per option | $ / shares |  | 1.33 |
Fair value assumption used for grant date and exercise share price of issued options | $ | $ 5.50 |  |
Description of option pricing model, share options granted | Black-Scholes model |  |
Expected volatility, share options granted | 43.00% |  |
Risk free interest rate, share options granted | 1.64% |  |
Maximum expiry date or expected life of options (years) | yr | 3 |  |
Maximum term of share options granted | 5 years |  |
Weighted average share price at time of exercise of options | $ | $ 5.69 |  | $ 7.16
Weighted average remaining contractual life of outstanding share options | yr |  | 2.82 | 3.35
Restricted Share Rights [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Grant date fair value, RSR's | $ |  | $ 2.6 |
Shares authorized for issuance share based compensation arrangement |  | 3,800,000 |
Granted | 597,200 |  |
Vesting period of sharebased compensation arrangement | yr | 3 |  |
Weighted average grant date fair value per share granted related to other equity instruments | $ / shares |  | $ 4.30 |
Number of outstanding, other equity instruments |  | 2,222,624 |

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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_47_a_i&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The option life of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_47_a_i&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The description of the option pricing model used for share options granted. [Refer: Option pricing model [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_47_a_i&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_47_a_i&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_47_b&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_45&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The number of share options granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 45 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_45_b_ii&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The weighted average exercise price of share options granted in a share-based payment arrangement. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 45 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_45_b_ii&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_47_b&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The weighted average share price. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2016-01-13 -Paragraph 45 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_45_c&doctype=Standard -URIDate 2016-03-31 + Details
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