DERIVATIVES AND FINANCIAL INSTRUMENTS (Schedule of Maximum Credit Exposure of Financial Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of detailed information about financial instruments [abstract]
Third party trade receivables (Note 17)	$ 17,242	$ 18,340
Finance lease income receivable (Note 17)	1,185	1,330
Cash & cash equivalents (Note 18)	23,564	77,109	$ 101,953	$ 9,102
Short-term investments (Note 19)	34,043
Total maximum credit exposure	$ 76,034	$ 96,779

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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The amount of current trade receivables. [Refer: Trade receivables]

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The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

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The present value of minimum finance lease payments receivable. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee.

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