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Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2014
Accounts Receivable[Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

  As of December 31,  Increase 
  2014  2013  (Decrease) 
Trade accounts receivable, gross $1,004,990  $609,638  $395,352 
Accumulated allowance for bad debt and product returns  (16,194)  (13,952)  (2,242)
Trade accounts receivable, net  988,796   595,686   393,110 
Other receivables  16,496   35,676   (19,180)
Income taxes receivable  0   48   (48)
Accounts receivable, net $1,005,292  $631,410  $373,882