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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities by Category (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of financial liabilities [line items] |  |
Financial liabilities | $ 317,554 | $ 288,948
Disclosure of financial assets [line items] |  |
Financial assets | 488,924 | 611,112
Trade and other payables |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 70,003 | 55,768
Debt |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 247,551 | 233,180
Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets | 419,212 | 459,864
Trade receivables |  |
Disclosure of financial assets [line items] |  |
Financial assets | 11,287 | 14,848
Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 29,542 | 114,001
Other financial assets |  |
Disclosure of financial assets [line items] |  |
Financial assets | 28,883 | 22,399
Amortized cost |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 301,669 | 278,939
Amortized cost | Trade and other payables |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 54,118 | 45,759
Amortized cost | Debt |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 247,551 | 233,180
FVTPL |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 15,885 | 10,009
FVTPL | Trade and other payables |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 15,885 | 10,009
FVTPL | Debt |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
FVTOCI |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
FVTOCI | Trade and other payables |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
FVTOCI | Debt |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 0 | 0
Amortized cost |  |
Disclosure of financial assets [line items] |  |
Financial assets | 25,172 | 14,773
Amortized cost | Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
Amortized cost | Trade receivables |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
Amortized cost | Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
Amortized cost | Other financial assets |  |
Disclosure of financial assets [line items] |  |
Financial assets | 25,172 | 14,773
FVTPL |  |
Disclosure of financial assets [line items] |  |
Financial assets | 434,210 | 482,338
FVTPL | Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets | 419,212 | 459,864
FVTPL | Trade receivables |  |
Disclosure of financial assets [line items] |  |
Financial assets | 11,287 | 14,848
FVTPL | Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
FVTPL | Other financial assets |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,711 | 7,626
FVTOCI |  |
Disclosure of financial assets [line items] |  |
Financial assets | 29,542 | 114,001
FVTOCI | Cash and cash equivalents |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
FVTOCI | Trade receivables |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | 0
FVTOCI | Marketable securities |  |
Disclosure of financial assets [line items] |  |
Financial assets | 29,542 | 114,001
FVTOCI | Other financial assets |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 0 | $ 0

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35I&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35M&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35N&doctype=Standard -URIDate 2018-03-16 + Details
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