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Financial instruments - Maturity of derivative liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities | $ 123,288 | $ 105,120
Within one year |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities | 6,679 | 7,114
1-3 years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities | 35,551 | 17,057
3-5 years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities | 40,130 | 28,864
More than 5 years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities | $ 40,928 | $ 52,085

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- Definition The amount of contractual undiscounted cash flows in relation to derivative financial liabilities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 39 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_39_b&doctype=Standard -URIDate 2017-03-09 + Details
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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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