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Accumulated other comprehensive income (loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Accumulated other comprehensive income loss [Line Items] |  |  |  |
Beginning Balance |  | $ (2,801) | $ (10,681) | $ (7,837)
Net unrealized gain (loss) arising from the year |  |  | 11,431 | (11,209)
Reclassification adjustment for (gains) loss included in the profit of the year | [1] | 2,483 | (3,551) | 8,365
Change in fair value for revaluation by debt instrument, net of hedging |  | 604 |  |
Change in fair value for revaluation by equity instrument, net of hedging |  | 187 | 0 | 0
Foreign currency translation adjustment, net |  | (60) |  |
Exchange difference in conversion of foreign operating currency |  | 1,550 | 0 | 0
Other comprehensive income (loss) from the year |  | 4,764 | 7,880 | (2,844)
Ending Balance |  | 1,963 | (2,801) | (10,681)
Financial assets at fair value through other comprehensive income, category [member] |  |  |  |
Disclosure of Accumulated other comprehensive income loss [Line Items] |  |  |  |
Beginning Balance |  | (853) | (8,931) | (6,817)
Net unrealized gain (loss) arising from the year |  |  | 7,048 | (6,267)
Reclassification adjustment for (gains) loss included in the profit of the year | [1] | 84 | 1,030 | 4,153
Change in fair value for revaluation by debt instrument, net of hedging |  | 612 |  |
Change in fair value for revaluation by equity instrument, net of hedging |  | (228) |  |
Foreign currency translation adjustment, net |  | 0 |  |
Exchange difference in conversion of foreign operating currency |  | 0 |  |
Other comprehensive income (loss) from the year |  | 468 | 8,078 | (2,114)
Ending Balance |  | (385) | (853) | (8,931)
Derivative financial instruments [Member] |  |  |  |
Disclosure of Accumulated other comprehensive income loss [Line Items] |  |  |  |
Beginning Balance |  | (1,948) | (1,750) | (1,020)
Net unrealized gain (loss) arising from the year |  |  | 4,383 | (4,942)
Reclassification adjustment for (gains) loss included in the profit of the year | [1] | 2,399 | (4,581) | 4,212
Change in fair value for revaluation by debt instrument, net of hedging |  | (8) |  |
Change in fair value for revaluation by equity instrument, net of hedging |  | 415 |  |
Foreign currency translation adjustment, net |  | 0 |  |
Exchange difference in conversion of foreign operating currency |  | 0 |  |
Other comprehensive income (loss) from the year |  | 2,806 | (198) | (730)
Ending Balance |  | 858 | (1,948) | (1,750)
Foreign currency translation adjustments [Member] |  |  |  |
Disclosure of Accumulated other comprehensive income loss [Line Items] |  |  |  |
Beginning Balance |  | 0 | 0 | 0
Net unrealized gain (loss) arising from the year |  |  |  |
Reclassification adjustment for (gains) loss included in the profit of the year | [1] | 0 | 0 | 0
Change in fair value for revaluation by debt instrument, net of hedging |  | 0 |  |
Change in fair value for revaluation by equity instrument, net of hedging |  | 0 |  |
Foreign currency translation adjustment, net |  | (60) |  |
Exchange difference in conversion of foreign operating currency |  | 1,550 |  |
Other comprehensive income (loss) from the year |  | 1,490 | 0 | 0
Ending Balance |  | $ 1,490 | $ 0 | $ 0
[1] | Reclassification adjustments include amounts recognized in profit of the year that had been part of other comprehensive income (loss) in this and previous years.

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- Definition The unrealized gain (loss) other comprehensive income on financial assets measured at fair value through other comprehensive income, net of tax. + References No definition available. + Details
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- Definition The amount of accumulated items of income and expense (including reclassification adjustments) that are not recognised in profit or loss as required or permitted by other IFRSs. [Refer: IFRSs [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of other comprehensive income, net of tax, related to gains (losses) in relation to changes in the revaluation surplus. [Refer: Other comprehensive income; Revaluation surplus] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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