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IMPAIRMENT AND IMPAIRMENT REVERSALS (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
$ / $
$ / oz
Dec. 31, 2016
USD ($)
$ / $
$ / oz
Canadian Malartic joint operation    
Impairment Reversals    
Nominal discount rate (as a percent)   6.00%
Estimate of future gold price | $ / oz 1,300 1,250
Inflation rate (as a percent) 2.00%  
Canadian Malartic joint operation | Minimum    
Impairment Reversals    
Nominal discount rate (as a percent) 5.75%  
Foreign exchange rates 0.78 0.75
Canadian Malartic joint operation | Maximum    
Impairment Reversals    
Nominal discount rate (as a percent) 9.00%  
Foreign exchange rates 0.80 0.80
Meadowbank mine    
Impairment Reversals    
Nominal discount rate (as a percent)   7.25%
Estimate of future gold price | $ / oz   1,250
Inflation rate (as a percent) 2.00%  
Impairment loss | $   $ 0
Gain on impairment reversal | $   37,200
Net of tax for gain on impairment reversal | $   $ 27,600
Meadowbank mine | Minimum    
Impairment Reversals    
Foreign exchange rates   0.75
Meadowbank mine | Maximum    
Impairment Reversals    
Foreign exchange rates   0.80
Meliadine project    
Impairment Reversals    
Nominal discount rate (as a percent)   9.00%
Estimate of future gold price | $ / oz   1,250
Inflation rate (as a percent) 2.00%  
Gain on impairment reversal | $   $ 83,000
Net of tax for gain on impairment reversal | $   $ 53,600
Meliadine project | Minimum    
Impairment Reversals    
Foreign exchange rates   0.75
Meliadine project | Maximum    
Impairment Reversals    
Foreign exchange rates   0.80