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Long-term debt - Convertible senior subordinated notes (Details)
$ / shares in Units, $ in Thousands
 11 Months Ended 12 Months Ended
Aug. 23, 2013
USD ($)
$ / shares
Nov. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2018
USD ($)
Disclosure of detailed information about borrowings [line items]          
Principal     $ 479,535 $ 702,181  
Deficit     (547,839) (610,908)  
Accumulated other comprehensive loss     146,153 94,294  
Interest expense, capitalized to mineral property interests     0 20,052  
Convertible senior subordinated notes          
Disclosure of detailed information about borrowings [line items]          
Principal     0 277,650  
Conversion ratio 0.2542912        
Conversion price per share (in usd per share) | $ / shares $ 3.93        
Threshold consecutive trading days 30 days        
Measurement period 5 days        
Measurement period consecutive trading days 5 days        
Unrealized (loss) gain on fair value of convertible notes     (11,000) 11,000  
Interest paid     8,000 8,000  
Convertible senior subordinated notes | Bottom of range          
Disclosure of detailed information about borrowings [line items]          
Threshold trading days 20 days        
Percentage of conversion price 130.00%        
Convertible senior subordinated notes | Top of range          
Disclosure of detailed information about borrowings [line items]          
Product of last reported sales price per common share and conversion rate 98.00%        
Fekola          
Disclosure of detailed information about borrowings [line items]          
Interest expense, capitalized to mineral property interests   $ 20,000      
Fekola | Convertible senior subordinated notes          
Disclosure of detailed information about borrowings [line items]          
Interest expense, capitalized to mineral property interests     12,000    
Fixed interest rate | Convertible senior subordinated notes          
Disclosure of detailed information about borrowings [line items]          
Borrowings, interest rate 3.25%        
Principal | Convertible senior subordinated notes          
Disclosure of detailed information about borrowings [line items]          
Principal $ 259,000   $ 0 $ 258,750  
Increase (decrease) due to changes in accounting policy required by IFRSs | IFRS 9          
Disclosure of detailed information about borrowings [line items]          
Deficit         $ 46,000
Accumulated other comprehensive loss         46,000
Increase (decrease) due to changes in accounting policy required by IFRSs | Convertible senior subordinated notes | IFRS 9          
Disclosure of detailed information about borrowings [line items]          
Deficit         11,000
Accumulated other comprehensive loss         $ 11,000