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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%

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