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Warranty
 3 Months Ended
Mar. 31, 2012
Warranty [Abstract]  
Warranty
8. Warranty
 
We record a liability for warranty claims at the time of sale. The amount of the liability is based on the trend in the historical ratio of claims to sales, the historical length of time between the sale and resulting warranty claim, new product introductions and other factors. Warranty terms on machines generally range from one to four years.
 
The changes in warranty reserves for the three months ended March 31, 2012 and 2011 were as follows:
 
   
Three Months Ended
 
   
March 31
 
   
2012
  
2011
 
Beginning balance
 $8,759  $7,043 
Additions charged to expense
  2,927   2,880 
Foreign currency fluctuations
  53   50 
Claims paid
  (2,929)  (2,590)
Ending balance
 $8,810  $7,383