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Receivables, Net (Tables)
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Receivables are summarized as follows:
 
2016
 
2015
Customers, trade
$
39,749

 
$
46,110

Other receivables
3,963

 
5,166

Gross receivables
43,712

 
51,276

Less: allowance for doubtful accounts
(107
)
 
(470
)
Receivables, net
$
43,605

 
$
50,806