FINANCIAL ASSETS AND LIABILITIES - Cash flows of the derivatives (Details) - Derivatives designated as cash flow hedges - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Cash flows of the derivatives
Cash flows	$ (2,000)	$ (11,000)
Cash flow hedge reserve	2,000	300
Less than 1 year
Cash flows of the derivatives
Cash flows	(2,000)	(9,000)
Between 1 and 3 years
Cash flows of the derivatives
Cash flows	$ 0	$ (2,000)

A component of equity representing the accumulated portion of gain (loss) on a hedging instrument that is determined to be an effective hedge for cash flow hedges. [Refer: Cash flow hedges [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 78
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_e&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 9
-IssueDate 2017-01-01
-Paragraph 6.5.11
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=9&date=2017-03-01&anchor=para_6.5.11&doctype=Standard
-URIDate 2017-03-09

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant