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Inventories
9 Months Ended
Sep. 30, 2011
Inventories [Abstract] 
Inventories
(4) Inventories
     A summary of inventories is as follows (in thousands):
                 
    September 30,     December 31,  
    2011     2010  
Raw materials and subassemblies
  $ 45,973     $ 39,412  
Work-in-process
    5,869       4,605  
Finished goods
    55,395       35,741  
Reserve for excess and obsolete inventories
    (12,997 )     (12,876 )
 
           
Total
  $ 94,240     $ 66,882  
 
           
     The increase in finished goods is principally due to inventory build related to the Company’s contract to outfit a BGP twelve-streamer vessel with the Company’s DigiSTREAMERTM data acquisition system and BGP is expected to deploy the system in the fourth quarter of this year.