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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 16,174 $ 13,514
Supplies and service parts 22,628 21,840
Finished products 31,957 36,969
Inventory at FIFO cost 70,759 72,323
Excess of FIFO cost over LIFO cost (3,785) (4,072)
Total inventory, net $ 66,974 $ 68,251