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

    As of 
June 30,
2014		     As of 
December 31,
2013		     (Decrease)
Increase		  
Trade accounts receivable, gross   $ 419,363     $ 609,638     $ (190,275)
Less: allowance for bad debt and product returns     14,483       13,952       531  
Trade accounts receivable, net     404,880       595,686       (190,806)
Other receivables     23,498       35,676       (12,178)
Income taxes receivable     48       48       --  
Accounts receivable, net   $ 428,426     $ 631,410     $ (202,984)