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Inventory (Major Classes of Inventory) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Inventory Disclosure [Abstract]    
Raw materials and starting stock $ 18,888 $ 12,263
Semi-finished and finished steel products 129,733 122,396
Operating materials 13,660 10,620
Gross inventory 162,281 145,279
Inventory reserves (3,414) (4,595)
Total inventory, net $ 158,867 $ 140,684