Earnings per share (Details) - shares	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Earnings per share [abstract]
Issued common shares at beginning of period	56,378,306	49,115,518
Effect of shares issued	677,436	587,226
Weighted average number of common shares outstanding - basic	57,055,742	49,702,744
Weighted average number of shares outstanding – diluted	57,055,742	49,702,744

The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 33
-IssueDate 2016-01-13
-Paragraph 70
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2016-03-30&anchor=para_70_b&doctype=Standard
-URIDate 2016-03-31

Name:	ifrs-full_DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration