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INCOME AND MINING TAXES - Components of Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
INCOME AND MINING TAXES    
Current income and mining taxes $ 87,639 $ 102,028
Deferred income and mining taxes:    
Origination and reversal of temporary differences 10,855 7,609
Total income and mining taxes expense $ 98,494 $ 109,637