Pension obligations (Schedule of detailed information about pension obligation) - (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Pension Obligations [Line Items]
Pension obligation - non-current	$ 23,316	$ 29,599
Pension obligations [Member]
Pension Obligations [Line Items]
Pension obligation - current	13,552	12,015
Pension obligation - non-current	23,316	29,599
Net liability	$ 36,868	$ 41,614

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 2019-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard
-URIDate 2019-03-27

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