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Inventories (Tables)
12 Months Ended
Dec. 31, 2012
Inventories [Abstract]  
Schedule of Inventory, Current [Table Text Block]
    December 31, 
    2012  2011 
  Raw materials and supplies$40,417 $41,771 
  Work in process and finished goods 32,054  32,987 
   $72,471 $74,758