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FINANCIAL RISK MANAGEMENT (Financial assets and liabilities at fair value) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | $ 338,144 | $ 183,459
Financial liabilities, at fair value | 6,001 | 287
Level 1 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 335,840 | 178,131
Financial liabilities, at fair value | 0 | 0
Level 2 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 2,304 | 5,328
Financial liabilities, at fair value | 6,001 | 287
Cash and cash equivalents |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 236,335 | 100,026
Cash and cash equivalents | Level 1 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 236,335 | 100,026
Cash and cash equivalents | Level 2 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 0 | 0
Other investments |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 99,505 | 83,117
Other investments | Level 1 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 99,505 | 78,105
Other investments | Level 2 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 0 | 5,012
Derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 2,304 | 316
Derivatives | Level 1 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 0 | 0
Derivatives | Level 2 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 2,304 | 316
Derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial liabilities, at fair value | 6,001 | 287
Derivatives | Level 1 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial liabilities, at fair value | 0 | 0
Derivatives | Level 2 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial liabilities, at fair value | $ 6,001 | $ 287

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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 + Details
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