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Inventories (Tables)
 12 Months Ended
Dec. 31, 2012
Inventory Disclosure [Abstract]  
Summary of Inventories
A summary of inventories is as follows (in thousands):
 
December 31,
 
2012
 
2011
Raw materials and purchased subassemblies
$
49,421

 
$
45,829

Work-in-process
8,613

 
8,294

Finished goods
26,880

 
29,059

Reserve for excess and obsolete inventories
(14,239
)
 
(13,037
)
Total
$
70,675

 
$
70,145