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Inventories (Tables)
12 Months Ended
Dec. 31, 2012
Inventories [Abstract]  
Inventories
                 
     2012     2011  

Raw materials

  $       22,514     $       20,798  

Work-in-progress

    31,164       29,314  

Finished goods

    5,907       7,835  

Supplies

    11,084       10,597  
    $ 70,669     $ 68,544