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Discontinued operations - Gain on Disposition (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 27, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net assets sold:        
Cash   $ 481,327 $ 451,962 $ 177,742
Accounts receivable and other   68,745 73,216  
Property, plant and equipment   4,003,211 4,042,199 $ 4,091,252
Accounts payable and accrued liabilities   (195,334) (179,372)  
Total assets   4,930,734 $ 4,930,545  
Tocantinzinho        
Net proceeds:        
Cash received $ (20,000)      
Tocantinzinho | Discontinued operations        
Net proceeds:        
Cash received   20,000    
Shares received   33,036    
Disposal costs incurred   (1,279)    
Working capital changes   59    
Net proceeds   51,816    
Net assets sold:        
Cash   340    
Accounts receivable and other   1,101    
Property, plant and equipment   47,466    
Accounts payable and accrued liabilities   (331)    
Capital lease obligations   (92)    
Total assets   48,484    
Gain on disposition of mine   $ 3,332