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Inventories
12 Months Ended
Dec. 31, 2012
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
December 31,
 
2012
 
2011
Raw materials and work in process
$
66,221

 
$
63,216

Supplies and service parts
72,551

 
68,600

Finished products
68,335

 
71,958

Inventory at FIFO cost
207,107

 
203,774

Excess of FIFO cost over LIFO cost
(27,429
)
 
(25,175
)
Total inventory, net
$
179,678

 
$
178,599