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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 13,258 $ 8,231
Supplies and service parts 23,627 21,841
Finished products 36,474 36,690
Inventory at FIFO cost 73,359 66,762
Excess of FIFO cost over LIFO cost (4,483) (4,483)
Total inventory, net $ 68,876 $ 62,279