Pension obligations (Schedule of detailed information about pension obligation) - (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Pension obligations [Member]
Pension Obligations [Line Items]
Pension obligation - current	$ 12,015	$ 11,854
Pension obligation - non-current	29,599	23,863
Net liability	41,614	35,717
Pension obligation - non-current	$ 29,599	$ 23,863

The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_a&doctype=Standard
-URIDate 2018-03-16

Name:	ifrs-full_SurplusDeficitInPlan
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant