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Financial instruments (Details 14) - Series C bonds [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Principal payment [Member] |  |  |
Financial instruments [Line Items] |  |  |
Payments for share issue costs | $ 0 | $ 57,290 | $ 5,729
Interest payment [Member] |  |  |
Financial instruments [Line Items] |  |  |
Payments for share issue costs | $ 0 | $ 1,515 | $ 3,275

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- Definition The cash outflow for share issue costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_17&doctype=Standard -URIDate 2018-03-16 + Details
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Period Type: | duration

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- References No definition available. + Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |