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Inventories
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories at December 31, 2017 and 2016 consisted of the following:
 
December 31,
 
2017
 
2016
Raw materials
$
30,166

 
$
28,541

Work in process
4,981

 
6,498

Supplies and service parts
45,366

 
45,152

Finished products
21,765

 
24,678

    Inventory at FIFO cost, net
102,278

 
104,869

Excess of FIFO cost over LIFO cost
(12,599
)
 
(12,143
)
    Total inventory, net
$
89,679

 
$
92,726