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Inventories
3 Months Ended
Mar. 31, 2013
Inventories [Abstract]  
Inventories
5.  Inventories

     
Inventories consist of the following:

   
March 31,
  
December 31,
 
   
2013
  
2012
 
        
Raw materials
 $16,673  $14,946 
Work in progress
  22,250   20,012 
Manufactured and purchased components
  20,920   18,702 
Finished goods
  29,910   30,988 
Product inventory
  89,753   84,648 
Capitalized contract costs
  7,861   5,391 
Total inventories
 $97,614  $90,039 

Inventoried costs include capitalized contract costs relating to programs and contracts with long-term production cycles, substantially all of which is not expected to be realized within one year. The Company believes these amounts will be fully recovered.