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

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

 

                 
    September 30,
2012		     December 31,
2011		  

Short-term inventories:

                

Raw materials

   $ 67,040     $ 65,511  

Work-in-process

     13,090       3,543  

Finished goods

     48,473       35,000  

Supplies

     3,076       3,115  
   

 

 

    

 

 

  
      131,679       107,169  
     

Long-term inventories:

                

Finished goods

     2,125       2,401  
   

 

 

    

 

 

  

Total inventories

   $ 133,804     $ 109,570