Equity - Dividends (Details) $ / shares in Units, $ in Thousands									12 Months Ended
Sep. 20, 2018 USD ($)	Aug. 20, 2018 $ / shares	Jun. 29, 2018 USD ($)	May 21, 2018 $ / shares	Dec. 29, 2016 USD ($) $ / shares	Sep. 28, 2016 USD ($) $ / shares	Aug. 12, 2016 USD ($) $ / shares	Mar. 14, 2016 USD ($) $ / shares	Dec. 31, 2017 $ / shares	Dec. 31, 2016 payment
Equity [abstract]
Number of interim dividend payments \| payment										4
Dividends paid, per share \| $ / shares		$ 0.06		$ 0.06	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.00
Dividends paid, ordinary shares \| $	$ 10,321		$ 10,321		$ 13,747	$ 13,747	$ 13,747	$ 13,747

The amount of dividends paid by the entity on ordinary shares. [Refer: Ordinary shares [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 34
-IssueDate 2018-01-01
-Paragraph 16A
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=34&date=2018-03-01&anchor=para_16A_f&doctype=Standard
-URIDate 2018-03-16

Name:	ifrs-full_DividendsPaidOrdinaryShares
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration