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FINANCIAL RISK MANAGEMENT (Details Narrative) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Recognized gains (losses) | $ 6,200 |
Vertical fall in cost of total fuel consumption | 109,700 |
Vertical rise in cost of total fuel consumption | 110,500 |
Currency swap contract [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Market value | 30,600 |
Currency swap contract [member] | CLF |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | 8,700 |
Fuel-Price Risk [Member] | Fuel Derivative [Member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Recognized gains (losses) | 15,100 | $ 48,000
Market value | 10,700 | 8,100
Foreign Exchange Rate Risk [Member] | Foreign Forward Instrument [Member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Recognized gains (losses) | 700 | 40,300
Market value |  | 1,100
Derivatives to BRL | $ 180,000 | 60,000
Derivatives to GBP |  | $ 10,000
Interest Rate Risk [Member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Percentage of fixed to fluctuations in interest rate | 63.00% | 63.00%
Interest Rate Risk [Member] | Interest Rate Derivative Contracts [Member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Market value | $ 6,600 | $ 17,200
Liquidity Risk [Member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Liquid funds balance | 1,614,000 | 1,486,000
Undrawn committed credit line | 450,000 | 325,000
Derivative margin guarantees for cash and stand-by letters of credit | $ 16,400 | $ 30,200

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- Definition The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 22 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_22_b&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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