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CURRENT AND DEFERRED INCOME TAX - Narrative (Details) - USD ($) $ in Thousands, shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Movement in deferred tax not recognized | $ (128,066) | $ (60,540)
Net proceeds from sale of marketable securities | 63,445 | 68,641
Deferred income tax liabilities | 107,909 | 114,576
Temporary differences associated with investments in subsidiaries | 58,724 | $ 75,814
Decrease in tax loss carry forward | $ 357,000 |
Statutory tax rate | 27.00% | 26.00%
Investments in Subsidiaries |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income tax liabilities | $ 17,617 | $ 22,744
Pretium Resources Inc |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Increase (decrease) in number of shares outstanding | (9.0) |
Net proceeds from sale of marketable securities | $ 63,400 |
Income tax payable | 7,800 |
Argentine Operation |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Movement in deferred tax not recognized | 125,700 |
Change to tax expense from restructuring activities | 114,100 |
Current tax expense | $ 4,700 |

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