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Inventories
6 Months Ended
Jun. 30, 2011
Inventories [Abstract]  
Inventories
3. Inventories
Inventories consist of the following:
                 
    June 30,     December 31,  
    2011     2010  
    (in thousands)  
Raw materials
  $ 16,955     $ 15,636  
Work in process
    4,784       4,137  
Finished goods
    4,347       4,814  
 
           
 
    26,086       24,587  
Less: allowances
    (1,967 )     (2,362 )
 
           
 
  $ 24,119     $ 22,225