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FINANCIAL RISK MANAGEMENT (Details 2) - Foreign Exchange Rate Risk [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Bottom of range [member] |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |
Appreciation (depreciation) of R$ /GBP | [1] | (10.00%) | (10.00%)
Positions effect on equity |  | $ 80,500 | $ 11,920
Effect on Other comprehensive income recognized in Total equity |  | $ (386,620) | $ 351,040
Top of range [member] |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |
Appreciation (depreciation) of R$ /GBP | [1] | 10.00% | 10.00%
Positions effect on equity |  | $ (80,500) | $ (11,920)
Effect on Other comprehensive income recognized in Total equity |  | $ (316,330) | $ (287,220)
Foreign Forward Instrument [Member] | Bottom of range [member] |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |
Appreciation (depreciation) of R$ /GBP | [2] | (10.00%) | (10.00%)
Positions effect on equity |  | $ (10,700) | $ (1,020)
Foreign Forward Instrument [Member] | Top of range [member] |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |
Appreciation (depreciation) of R$ /GBP | [2] | 10.00% | 10.00%
Positions effect on equity |  | $ 9,700 | $ 3,440
[1] | Appreciation (depreciation) of US$ regard to the covered currencies.
[2] | Both currencies (BRL and GBP) only apply period to the closing of 2016.

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