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Accounts Receivable (Tables)
9 Months Ended
Sep. 30, 2014
Accounts Receivable[Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

 As of 
September 30, 2014
  As of 
December 31, 2013
  (Decrease) Increase 
Trade accounts receivable, gross $550,401  $609,638  $(59,237)
Less: allowance for bad debt and product returns  15,704   13,952   1,752 
Trade accounts receivable, net  534,697   595,686   (60,989)
Other receivables  27,367   35,676   (8,309)
Income taxes receivable  1,500   48   1,452 
Accounts receivable, net $563,564  $631,410  $(67,846)