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Financial instruments (Details 17) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Series M Bonds [Member] | Interest payment [Member] |  |  |
Financial instruments [Line Items] |  |  |
Repayments of bonds, notes and debentures | $ 0 | $ 667 | $ 1,242
Series M Bonds [Member] | Principal payment [Member] |  |  |
Financial instruments [Line Items] |  |  |
Repayments of bonds, notes and debentures | 0 | 40,726 | 0
Series O bonds [Member] | Interest payment [Member] |  |  |
Financial instruments [Line Items] |  |  |
Repayments of bonds, notes and debentures | $ 2,457 | $ 2,301 | $ 2,142

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- Definition The cash outflow for repayments of bonds, notes and debentures. + 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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- Details
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- Details
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- Details
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- Details
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