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Other-net - Summary of Other-net Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary of other-net expense      
Metal consignment fees $ 9,305 $ 8,587 $ 9,247
Amortization of intangible assets 5,973 2,377 1,400
Foreign currency loss (gain) 1,573 (2,569) 666
Net (gain) loss on disposal of fixed assets (282) 466 344
Rental income 0 0 (87)
Other items 168 (398) 213
Total other-net $ 16,737 $ 8,463 $ 11,783