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DEFERRED INCOME TAX (Changes in deferred tax assets and liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liability, beginning balance | $ (403,278) |  |
Deferred tax assets, beginning balance | 163,538 |  |
Translation differences | (36) | $ 25,166 |
Deferred tax (charge) credit | 39,894 | 38,785 |
Credits directly to other comprehensive income | 12,100 | 19,537 |
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes | 0 | (16,979) | $ 0
Deferred tax liability, ending balance | (346,485) | (403,278) |
Deferred tax assets, ending balance | 158,703 | 163,538 |
Deferred tax assets recognized on unused tax losses | 31,084 | 42,766 |
Unused tax credits for which no deferred tax asset recognised | 200,000 | 400,000 |
Unused tax losses for which no deferred tax asset recognised | 1,000,000 | 1,400,000 |
PP&E |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liability, beginning balance | (437,376) | (522,455) |
Translation differences | 46 | 27,077 |
Deferred tax (charge) credit | 11,190 | 58,002 |
Deferred tax liability, ending balance | (426,140) | (437,376) | (522,455)
Inventories |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liability, beginning balance | (63,460) | (41,316) |
Translation differences | 0 | 2,604 |
Deferred tax (charge) credit | 33,273 | (24,748) |
Deferred tax liability, ending balance | (30,187) | (63,460) | (41,316)
Intangible assets |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liability, beginning balance | (17,109) | (15,926) |
Translation differences | 0 | 316 |
Deferred tax (charge) credit | (3,601) | (1,499) |
Deferred tax liability, ending balance | (20,710) | (17,109) | (15,926)
Other |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liability, beginning balance | (1,189) | (1,088) |
Translation differences | 0 | 0 |
Deferred tax (charge) credit | (832) | (101) |
Deferred tax liability, ending balance | (2,021) | (1,189) | (1,088)
Deferred tax liabilities |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liability, beginning balance | (519,134) | (580,785) |
Translation differences | 46 | 29,997 |
Deferred tax (charge) credit | 40,030 | 31,654 |
Deferred tax liability, ending balance | (479,058) | (519,134) | (580,785)
Provisions |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets, beginning balance | 45,654 | 72,947 |
Translation differences | 0 | (572) |
Deferred tax (charge) credit | 6,688 | (26,721) |
Credits directly to other comprehensive income | 0 | 0 |
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes |  | 0 |
Deferred tax assets, ending balance | 52,342 | 45,654 | 72,947
Trade receivables |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets, beginning balance | 10,200 | 11,265 |
Translation differences | 0 | (539) |
Deferred tax (charge) credit | (1,014) | (526) |
Credits directly to other comprehensive income | 0 | 0 |
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes |  | 0 |
Deferred tax assets, ending balance | 9,186 | 10,200 | 11,265
Tax losses |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets, beginning balance | 42,766 | 33,382 |
Translation differences | 0 | 0 |
Deferred tax (charge) credit | (11,682) | 9,384 |
Credits directly to other comprehensive income | 0 | 0 |
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes |  | 0 |
Deferred tax assets, ending balance | 31,084 | 42,766 | 33,382
Other |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets, beginning balance | 180,774 | 122,984 |
Translation differences | (82) | (3,720) |
Deferred tax (charge) credit | 5,873 | 24,994 |
Credits directly to other comprehensive income | 12,100 | 19,537 |
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes |  | 16,979 |
Deferred tax assets, ending balance | 198,665 | 180,774 | 122,984
Deferred tax assets |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets, beginning balance | 279,394 | 240,578 |
Translation differences | (82) | (4,831) |
Deferred tax (charge) credit | (136) | 7,131 |
Credits directly to other comprehensive income | 12,100 | 19,537 |
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes |  | 16,979 |
Deferred tax assets, ending balance | $ 291,276 | $ 279,394 | $ 240,578

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