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CURRENT AND DEFERRED INCOME TAX - Income Tax Differences (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]    
Income before taxes $ 74,587 $ 80,985
Statutory tax rate 26.00% 26.00%
Expected income tax $ 19,392 $ 21,056
Increase (decrease) resulting from permanent differences (17,048) (15,321)
Increase (decrease) resulting from foreign exchange 4,806 (2,752)
Differences in foreign and future tax rates 48,167 2,249
Mining & overseas withholding tax 5,134 9,498
Expired losses 3,658 0
Change in estimates in respect of prior years (484) (5,970)
Tax benefits not recognized in prior year reversed in current year 0 (3,412)
Movement in deferred tax not recognized (60,540) 7,601
Other 36 3,079
Total income tax expense 3,121 16,028
Current tax expense 3,094 17,886
Deferred tax expense 27 (1,858)
Total income tax expense $ 3,121 $ 16,028