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Inventories (Tables)
 6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventory Components Inventories at June 30, 2019 and December 31, 2018 consisted of the following:
 
June 30,
2019
 
December 31,
2018
Raw materials
$
13,740

 
$
8,231

Supplies and service parts
23,701

 
21,841

Finished products
40,389

 
36,690

Inventory at FIFO cost
77,830

 
66,762

Excess of FIFO cost over LIFO cost
(4,483
)
 
(4,483
)
Total inventory, net
$
73,347

 
$
62,279