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Earnings per share ("EPS") (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Calculation Of Basic And Diluted Earnings Per Share [Abstract] |  |  |
Profit/loss for the period used for calculation of EPS - basic | $ (46,927) | $ 6,602 | $ 9,260
Profit/loss for the period used for calculation of EPS - dilutive | $ (46,927) | $ 6,602 | $ 9,260
Basic earnings per share |  |  |
Weighted average number of shares (basic) | 143,429,610 | 124,536,338 | 93,382,757
Diluted earnings per share |  |  |
Dilutive equity awards | 5,311 |  | 6,853
Weighted average number of shares (dilutive) | 143,434,921 | 124,536,338 | 93,389,610

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- Definition The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_70_b&doctype=Standard -URIDate 2017-03-09 + Details
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