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Inventories, net
12 Months Ended
Dec. 31, 2011
Inventories, net  
Inventories, net

Note 5.  Inventories, net

        The components of inventories are as follows:

 
  December 31,  
 
  2011   2010  
 
  (in thousands)
 

Raw materials

  $ 85,829   $ 74,596  

Work in process

    25,639     29,848  

Finished goods (completed systems)

    8,555     5,209  
           

 

  $ 120,023   $ 109,653  
           

        When recorded, inventory reserves are intended to reduce the carrying value of inventories to their net realizable value. The Company establishes inventory reserves when conditions exist that indicate inventory may be in excess of anticipated demand or is obsolete based upon assumptions about future demand for the Company's products or market conditions. The Company regularly evaluates the ability to realize the value of inventories based on a combination of factors including the following: forecasted sales or usage, estimated product end of life dates, estimated current and future market value and new product introductions. Purchasing and usage alternatives are also explored to mitigate inventory exposure. As of December 31, 2011 and 2010, inventories are stated net of inventory reserves of $22.8 million and $27.5 million respectively. The decrease in inventory reserves in 2011 is primarily due to the sale or disposal of $5.6 million of previously reserved inventory.