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Product Warranty (Tables)
3 Months Ended
Mar. 31, 2013
Product Warranties Disclosures [Abstract]  
Summary of product warranty activity
The following table summarizes product warranty activity during 2013 and 2012:
 
 
Three Months Ended
 
March 31,
 
2013
 
2012
Beginning balance
$
814

 
$
933

Charges to expense
315

 
161

Costs incurred
(326
)
 
(146
)
Ending balance
$
803

 
$
948