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Inventories (Tables)
 6 Months Ended
Jun. 30, 2012
Inventories [Abstract]  
Components of inventories

Inventories are stated at the lower of cost or market and consist of the following (in thousands):

 

                 
    June 30,
2012		     December 31,
2011		  

Short-term inventories:

                

Raw materials

   $ 64,682     $ 65,511  

Work-in-process

     7,212       3,543  

Finished goods

     45,575       35,000  

Supplies

     3,135       3,115  
   

 

 

    

 

 

  
      120,604       107,169  

Long-term inventories:

                

Finished goods

     2,237       2,401  
   

 

 

    

 

 

  

Total inventories

   $ 122,841     $ 109,570