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Other-net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of other-net expense      
Metal consignment fees $ 9,247 $ 10,999 $ 8,782
Amortization of Intangible Assets 1,400 2,265 4,629
Foreign currency loss (gain) 666 1,487 (722)
Net loss (gain) on disposal of fixed assets 344 518 234
Rental Income (87) (416) (168)
Other items 213 481 1,138
Total $ 11,783 $ 15,334 $ 13,893