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Inventories (Tables)
 6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventory Components
Inventories at June 30, 2018 and December 31, 2017 consisted of the following:
 
June 30,
2018
 
December 31,
2017
Raw materials
$
13,502

 
$
11,767

Supplies and service parts
21,822

 
21,475

Finished products
19,461

 
13,261

Inventory at FIFO cost
54,785

 
46,503

Excess of FIFO cost over LIFO cost
(5,734
)
 
(5,734
)
Total inventory, net
$
49,051

 
$
40,769