Share Capital (Fair Value Assumptions) (Details)	12 Months Ended
Dec. 31, 2018 USD ($) month shares	Dec. 31, 2017 CAD ($) month shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Granted \| shares	1,009,100	578,490
Weighted average share price at grant date (CAD$)	$ 6.56	$ 9.62
Expected dividend yield	0.70%	0.70%
Expected stock price volatility (based on historical volatility)	57.00%	57.00%
Weighted average per share fair value of stock options granted (CAD$)	$ 3.11	$ 4.27
Bottom of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Risk-free rate	1.88%	0.91%
Expected life of option (months)	42	36
Top of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Risk-free rate	2.06%	1.35%
Expected life of option (months)	84	84

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2018-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_a_i&doctype=Standard
-URIDate 2018-03-16

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- Definition

The option life of share options granted.

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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]]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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No definition available.

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The percentage of an expected dividend used to calculate the fair value of share options granted.

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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 2018-01-01
-Paragraph 45
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_ii&doctype=Standard
-URIDate 2018-03-16

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- Definition

The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2018-01-01
-Paragraph 47
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_a&doctype=Standard
-URIDate 2018-03-16

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- Definition

The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

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