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Financial instruments (Details 23) - Interest payment [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Series Q bonds [Member]
Financial instruments [Line Items]
Repayments of bonds, notes and debentures	$ 3,791	$ 319	$ 0
Single Series Fifth Issue Bonds [Member]
Financial instruments [Line Items]
Repayments of bonds, notes and debentures	$ 9,563	$ 0	$ 0

X

- 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 2019-01-01
-Paragraph 17
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_17&doctype=Standard
-URIDate 2019-03-27

+ Details

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Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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X

- Details

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X

- Details

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X

- Details

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