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Share-based payments - Summary of Share Based Payments Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share based payments | $ 6,989 | $ 11,218
Employee stock option plan [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share based payments | 3,392 | 6,736
Restricted Shares Without Performance Criteria [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share based payments | 1,425 | 2,716
Restricted Shares With Performance Criteria [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share based payments | 175 | 0
Deferred share units plans [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share based payments | (277) | (1,023)
Performance share unit [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share based payments | $ 2,274 | $ 2,789

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- Definition 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. + References No definition available. + Details
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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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- Details
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- Details
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