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Share Based Payments (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 $ / shares | Dec. 31, 2017 $ / shares
Restricted Share Units [member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Description of vesting requirements for share-based payment arrangement | RSUs are settled in either cash or equity, as determined by the Company's Board of Directors at the grant date and typically vest over three years. | RSUs are settled in either cash or equity, as determined by the Company's Board of Directors at the grant date and typically vest over three years. |  |
Granted, other units | 422,030 | 422,030 |  |
Fair value per unit | (per share) |  |  | $ 6.35 | $ 4.71
Performance Share Units [member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Description of vesting requirements for share-based payment arrangement | Performance Share Units are performance-based awards for the achievement of specified performance metrics by specified deadlines and are settled in either cash or equity, as determined by the Company's Board of Directors at the grant date and typically vest over three years. | Performance Share Units are performance-based awards for the achievement of specified performance metrics by specified deadlines and are settled in either cash or equity, as determined by the Company's Board of Directors at the grant date and typically vest over three years. |  |
Granted, other units | 1,002,166 | 1,002,166 |  |
Fair value per unit | (per share) | $ 6.20 | $ 4.71 |  | $ 0.00
Bottom of range [member] | Restricted Share Units [member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Fair value per unit | (per share) | 6.20 | 4.71 |  |
Top of range [member] | Restricted Share Units [member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Fair value per unit | (per share) | $ 7.15 | $ 5.54 |  |

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- Definition The fair value of number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References No definition available. + Details
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- Definition The description of the vesting requirements for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_a&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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