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Inventories (Tables)
12 Months Ended
Dec. 31, 2012
Inventories [Abstract]  
Components of inventories
The components of inventory are summarized below (in thousands):
 
As of December 31,
 
2012
 
2011
 
Inventories:
Raw materials
$20,003
$25,460
Work in process
15,608
15,753
Finished goods
4,741
 
4,799
 
$40,352
 
$46,012