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INCOME AND MINING TAXES - Reconciliation of Deferred Income and Mining Tax Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Deferred income and mining tax liabilities    
Deferred income and mining tax liabilities - beginning of year $ 819,562 $ 802,114
Income and mining tax impact recognized in net income 10,181 7,888
Income tax impact recognized in other comprehensive income (loss) and equity (2,402) 4,458
Reduction of flow through share liability   5,102
Deferred income and mining tax liabilities - end of year $ 827,341 $ 819,562