Financial instruments (Details 22) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financial instruments [Line Items]
Financial liabilities at fair value through profit or loss	$ 0	$ 0	$ 498
Gains (losses) on hedging instrument, fair value hedges	0	(229)	1,062
Derivative instruments (IRS) [Member]
Financial instruments [Line Items]
Financial liabilities at fair value through profit or loss	0	0	283
Gains (losses) on hedging instrument, fair value hedges	0	(229)	(242)
Derivate instruments (options) [Member]
Financial instruments [Line Items]
Financial liabilities at fair value through profit or loss	0	0	215
Gains (losses) on hedging instrument, fair value hedges	$ 0	$ 0	$ 1,304

The amount of financial liabilities that meet either of the following conditions: (a) they meet the definition of held for trading; or (b) upon initial recognition they are designated by the entity as at fair value through profit or loss. An entity may use this designation only when permitted by paragraph 4.3.5 of IFRS 9 (embedded derivatives) or when doing so results in more relevant information, because either: (a) it eliminates or significantly reduces a measurement or recognition inconsistency (sometimes referred to as ‘an accounting mismatch’) that would otherwise arise from measuring assets or liabilities or recognising the gains and losses on them on different bases; or (b) a group of financial liabilities or financial assets and financial liabilities is managed and its performance is evaluated on a fair value basis, in accordance with a documented risk management or investment strategy, and information about the group is provided internally on that basis to the entity’s key management personnel (as defined in IAS 24). [Refer: At fair value [member]; Key management personnel of entity or parent [member]; Derivatives [member]; Financial assets; Financial liabilities]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 8
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_8_e&doctype=Standard
-URIDate 2017-03-09

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