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Accounts Receivable and Other Receivables (Tables)
 6 Months Ended
Jun. 30, 2017
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Accounts receivable balances consisted of the following (in thousands):
 
June 30,
2017
 
December 31,
2016
Accounts receivable, gross
$
43,641

 
$
38,433

Less: allowance for doubtful accounts
(55
)
 
(55
)
Accounts receivable, net
$
43,586

 
$
38,378