Equity based compensation (Details) - Vermilion incentive plan [Member] - Awards Awards in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Equity Based Compensation [Line Items]
Opening balance	1,685	1,738
Granted	932	563
Vested	(520)	(539)
Forfeited	(166)	(77)
Closing balance	1,931	1,685

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2018-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_b&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2018-01-01
-Paragraph 45
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-URIDate 2018-03-16

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The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 2
-IssueDate 2018-01-01
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The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement.

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The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

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