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Inventories (Tables)
6 Months Ended
Jun. 30, 2012
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]

Inventories consisted of the following:

 

  June 30,  December 31, 
  2012  2011 
Raw materials $68,102  $72,308 
Work-in-progress  14,641   14,723 
Finished goods  33,751   33,615 
Total inventories, net $116,494  $120,645