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INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2017 | Jan. 01, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Tax effect from change in tax rate | $ (1,600) | $ (1,633) | $ 0
Net deferred tax expenses |  | 3,300 |
Increase in non-recognition of deferred income tax assets |  | 56,500 |
Tax effect from revaluation of deferred income tax liabilities |  | (62,228) | 0
Tax benefit arising from previously unrecognised tax loss, tax credit or temporary difference of prior period used to reduce current tax expense | 67,200 | 67,200 | $ 27,500
Non-deductible reserves and accruals |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Reduction in deferred income tax assets |  | 9,000 |
Pro forma |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Effect of different tax rates on earnings of foreign subsidiaries | 305,000 | 305,000 |
Pro forma | Unrealised foreign exchange gains (losses) |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred income taxes (note 18) | $ 68,000 | $ 68,000 |

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