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Deferred income tax (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Deferred income tax [Abstract] |  |  |
Current | $ 23,837 | $ 39,444 | $ 14,222
Deferred | (5,825) | 14,060 | 541
Tax expense (income), continuing operations | $ 18,012 | $ 53,504 | $ 14,763

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- Definition The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 80 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_80_a&doctype=Standard -URIDate 2017-03-09 + Details
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