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INCOME AND MINING TAXES - Components of Net Deferred Income and Mining Tax Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Total deferred income and mining tax liabilities      
Total deferred income and mining tax liabilities $ 827,341 $ 819,562 $ 802,114
Mining Properties      
Total deferred income and mining tax liabilities      
Total deferred income and mining tax liabilities 1,089,751 1,046,218  
Net capital loss carry forwards      
Total deferred income and mining tax liabilities      
Total deferred income and mining tax liabilities (97,946) (80,227)  
Mining taxes      
Total deferred income and mining tax liabilities      
Total deferred income and mining tax liabilities (75,238) (76,344)  
Reclamation provisions and other labilities      
Total deferred income and mining tax liabilities      
Total deferred income and mining tax liabilities $ (89,226) $ (70,085)