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Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventory Components
Inventories at December 31, 2018 and 2017 consisted of the following:
 
December 31,
 
2018
 
2017
Raw materials
$
8,231

 
$
11,767

Supplies and service parts
21,841

 
21,475

Finished products
14,897

 
13,261

    Inventory at FIFO cost, net
44,969

 
46,503

Excess of FIFO cost over LIFO cost
(3,005
)
 
(5,734
)
    Total inventory, net
$
41,964

 
$
40,769