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Inventories (Tables)
3 Months Ended
Mar. 31, 2012
Inventories  
Schedule of inventories
 
  March 31,
2012
  December 31,
2011
 
 
  (in thousands)
 

Finished goods

  $ 294,214   $ 323,315  

Raw materials and precious metals

    194,648     157,931  

In-process inventories

    61,862     115,372  

Parts and supplies

    39,383     39,603  
           

 

  $ 590,107   $ 636,221