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Inventories (Tables)
12 Months Ended
Dec. 31, 2013
Inventories [Abstract]  
Schedule of Inventory, Current [Table Text Block]
    December 31, 
    2013  2012 
  Raw materials and supplies$37,063 $40,417 
  Work in process and finished goods 34,494  32,054 
   $71,557 $72,471