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Inventories (Tables)
9 Months Ended
Sep. 30, 2012
Inventories  
Schedule of inventories
 
  September 30,
2012
  December 31,
2011
 
 
  (in thousands)
 

Finished goods

  $ 263,571   $ 323,315  

Raw materials and precious metals

    177,615     157,931  

In-process inventories

    36,450     115,372  

Parts and supplies

    46,723     39,603  
           

 

  $ 524,359   $ 636,221