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Related party disclosures (Details Textual) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) Employees | Dec. 31, 2016 USD ($) Employees | Dec. 31, 2017 | Dec. 31, 2016
Related party disclosures [Line Items] |  |  |  |
Key management personnel compensation | $ 3,231 | $ 2,292 |  |
Number of employees | 4,921 | 4,751 | 115 | 105
Chairman [Member] | Fixed compensation [Member] |  |  |  |
Related party disclosures [Line Items] |  |  |  |
Key management personnel compensation | $ 400 |  |  |
Chairman [Member] | Variable compensation [Member] |  |  |  |
Related party disclosures [Line Items] |  |  |  |
Key management personnel compensation, Percentage | 0.15% |  |  |
Directors [Member] | Fixed compensation [Member] |  |  |  |
Related party disclosures [Line Items] |  |  |  |
Key management personnel compensation | $ 200 |  |  |
Directors [Member] | Variable compensation [Member] |  |  |  |
Related party disclosures [Line Items] |  |  |  |
Key management personnel compensation, Percentage | 0.06% |  |  |
Directors committee [Member] | Fixed compensation [Member] |  |  |  |
Related party disclosures [Line Items] |  |  |  |
Key management personnel compensation | $ 75 |  |  |
Directors committee [Member] | Variable compensation [Member] |  |  |  |
Related party disclosures [Line Items] |  |  |  |
Key management personnel compensation, Percentage | 0.02% |  |  |
Health, Safety and Environmental Matters Committee [Member] | Fixed compensation [Member] |  |  |  |
Related party disclosures [Line Items] |  |  |  |
Key management personnel compensation | $ 50 |  |  |
Corporate Governance Committee [Member] | Fixed compensation [Member] |  |  |  |
Related party disclosures [Line Items] |  |  |  |
Key management personnel compensation | 50 |  |  |
Executives [Member] |  |  |  |
Related party disclosures [Line Items] |  |  |  |
Key management personnel compensation | $ 27,367 | $ 20,439 |  |
Number of employees | Employees | 120 | 103 |  |

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- Definition The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_17&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of personnel employed by the entity at a date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The percentage of compensation in profits to key management personnel. + References No definition available. + Details
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