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FINANCIAL RISK MANAGEMENT (Details 1) - Fuel-Price Risk [Member] - Fuel Derivative [Member] - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Top of range [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Benchmark price (per barrel)	$ 5	$ 5
Positions effect on equity	$ 1,800	$ 3,120
Bottom of range [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Benchmark price (per barrel)	$ (5)	$ (5)
Positions effect on equity	$ (3,300)	$ (4,780)

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

It represents the benchmark price percentage.

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+ Details

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- Definition

It represents the amount of positions effect on equity.

+ References

No definition available.

+ Details

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