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Segment information - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Disclosure of operating segments [line items]    
Number of reportable segments | segment 5  
Metal sales $ 940,914 $ 1,026,685
Turkey    
Disclosure of operating segments [line items]    
Metal sales 486,069 588,188
Turkey | Two customers    
Disclosure of operating segments [line items]    
Metal sales 319,339 368,459
Canada    
Disclosure of operating segments [line items]    
Metal sales $ 273,358 $ 257,267
Canada | One customer    
Disclosure of operating segments [line items]    
Percentage of company's revenue 99.00% 99.00%