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Inventory
 12 Months Ended
Dec. 31, 2011
Inventory [Abstract]  
Inventory

3. Inventory

Inventory, net of reserves, consisted of the following amounts (in thousands):

 

 

                 
    December 31,  
              2011                      2010          

Parts and supplies

   $       225,804     $      244,618  

Work in progress

     103,414       116,371  

Finished goods

     32,467       35,298  
   

 

 

    

 

 

  

Inventory, net of reserves

   $ 361,685     $ 396,287  
   

 

 

    

 

 

  

During 2011, 2010 and 2009, we recorded $4.9 million, $2.2 million and $5.3 million, respectively, in inventory write-downs and reserves for inventory, which were either obsolete, excess or carried at a price above market value. As of December 31, 2011 and 2010, we had inventory reserves of $16.8 million and $18.3 million, respectively.