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Inventories (Tables)
12 Months Ended
Dec. 31, 2012
Inventories [Abstract]  
Inventory Tabular Disclosure

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

 

                 
    December 31,  
    2012     2011  

Short-term inventories:

               

Raw materials

  $ 56,913     $ 65,511  

Work-in-process

    10,157       3,543  

Finished goods

    43,374       35,000  

Supplies

    3,101       3,115  
   

 

 

   

 

 

 
      113,545       107,169  

Long-term inventories:

               

Finished goods

    1,608       2,401  
   

 

 

   

 

 

 

Total inventories

  $ 115,153     $ 109,570