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Share capital - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of share capital, reserves and other equity interest [Abstract] |  |
Profit (loss), attributable to owners of parent | $ 28,938 | $ 56,852
Dilutive impact of gain on fair value of convertible notes | (10,651) | 0
Diluted net income for the year (attributable to shareholders of the Company) | $ 18,287 | $ 56,852
Basic weighted average number of shares outstanding (in shares) | 986,755 | 976,366
Effect of dilutive convertible notes (in shares) | 49,393 | 0
Effect of dilutive securities, stock options (in shares) | 10,762 | 14,627
Effect of dilutive securities, restricted share units (in shares) | 458 | 420
Diluted weighted average number of shares outstanding (in shares) | 1,047,368 | 991,413
Earnings (loss) per share (attributable to Shareholders of the Company), Basic (in USD per share) | $ 0.03 | $ 0.06
Earnings (loss) per share (attributable to Shareholders of the Company), Diluted (in USD per share) | $ 0.02 | $ 0.06

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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_66&doctype=Standard -URIDate 2017-03-09 + Details
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