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Inventories (Tables)
 12 Months Ended
Dec. 31, 2014
Inventory Disclosure [Abstract]  
Inventory Components
Inventories at December 31, 2014 and 2013 consisted of the following:
 
December 31,
 
2014
 
2013
Raw materials and work in process
$
37,175

 
$
33,920

Supplies and service parts
33,760

 
48,165

Finished products
26,992

 
38,515

Inventory at FIFO cost
97,927

 
120,600

Excess of FIFO cost over LIFO cost
(13,100
)
 
(17,020
)
Total inventory, net
$
84,827

 
$
103,580