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Equity based compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Vermilion incentive plan [Member]  
Disclosure Of Equity Based Compensation [Line Items]  
Disclosure of number and weighted average exercise prices of other equity instruments [text block]
The following table summarizes the number of awards outstanding under the VIP and the Five-Year Compensation Arrangement:
 
Number of Awards ('000s)
2018
 
2017
Opening balance
1,685
 
 
1,738
 
Granted
932
 
 
563
 
Vested
(520
)
 
(539
)
Forfeited
(166
)
 
(77
)
Closing balance
1,931
 
 
1,685