TRADE AND OTHER RECEIVABLES - Movements in the allowance for doubtful debts (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful debts
Balance at beginning of year	$ 140,929
Balance at end of the year	137,834	$ 140,929
Trade and other receivables
Allowance for doubtful debts
Balance at end of the year	13,760
Trade and other receivables \| Impairment
Allowance for doubtful debts
Balance at beginning of year	1,403	1,329
Effect of IFRS 9 as at January 1, 2018	1,044
Adjustment from the adoption of IFRS 9	2,447
Provisions recognized on receivables	811
Exchange difference	(76)	74
Balance at end of the year	$ 3,182	$ 1,403

- Definition

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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