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Inventories
6 Months Ended
Jun. 30, 2011
Inventories [Abstract]  
Inventories
(5) Inventories
     A summary of inventories is as follows (in thousands):
                 
    June 30,     December 31,  
    2011     2010  
Raw materials and subassemblies
  $       42,552     $ 39,412  
Work-in-process
    4,370       4,605  
Finished goods
    52,244       35,741  
Reserve for excess and obsolete inventories
    (13,006 )     (12,876 )
 
           
Total
  $ 86,160     $ 66,882