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SEGMENTED INFORMATION - Geographic (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Revenue And Other Non Current Assets By Geographic    
Revenues from Mining Operations $ 2,242,604 $ 2,138,232
Total non-current assets 6,404,067 5,877,772
Canada    
Revenue And Other Non Current Assets By Geographic    
Revenues from Mining Operations 1,542,191 1,386,013
Total non-current assets 4,452,478 3,970,435
Mexico    
Revenue And Other Non Current Assets By Geographic    
Revenues from Mining Operations 451,652 499,873
Total non-current assets 1,026,740 1,010,063
Finland    
Revenue And Other Non Current Assets By Geographic    
Revenues from Mining Operations 248,761 252,346
Total non-current assets 900,831 873,220
Sweden    
Revenue And Other Non Current Assets By Geographic    
Total non-current assets 13,812 13,812
United States    
Revenue And Other Non Current Assets By Geographic    
Total non-current assets $ 10,206 $ 10,242