BORROWINGS (Schedule of Carrying Value of Exchangeable Senior Notes) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Borrowings [abstract]
Balance at 1 January	$ 92,232	$ 91,514
Accretion interest	723	718	$ 535
Balance at 31 December	$ 92,955	$ 92,232	$ 91,514

The amount of interest expense on other financial liabilities. [Refer: Interest expense; Other financial liabilities]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2017-03-09

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