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Inventory
6 Months Ended
Jun. 30, 2011
Inventory [Abstract]  
Inventory
3. Inventory
     Inventory includes material, labor and overhead, and is stated at lower of cost (first-in, first-out) or market. The components of inventory are as follows (in thousands):
                 
    June 30,     December 31,  
    2011     2010  
Purchased components
  $ 14,230     $ 14,928  
Work in process
    10,229       6,372  
Finished goods
    14,754       13,650  
 
           
 
  $ 39,213     $ 34,950