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FINANCIAL INSTRUMENTS (Commodity contracts outstanding) (Details) - Commodity risk - Cash flow hedges pound in Thousands, barrel in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) pound barrel
Disclosure of detailed information about hedging instruments [line items] |
Financial assets, carrying value | $ 2,213
Financial assets, fair value | $ 2,213
Forward contracts |
Disclosure of detailed information about hedging instruments [line items] |
Nominal amount of hedging instrument | pound | 20,232
Financial assets, carrying value | $ 507
Financial assets, fair value | $ 507
Swap and collar contracts |
Disclosure of detailed information about hedging instruments [line items] |
Nominal amount of hedging instrument | barrel | 144
Financial assets, carrying value | $ 1,706
Financial assets, fair value | $ 1,706
Minimum |
Disclosure of detailed information about hedging instruments [line items] |
Remaining maturity | 0 years
Maximum |
Disclosure of detailed information about hedging instruments [line items] |
Remaining maturity | 12 years

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