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Accounts Receivable and Other Receivables (Tables)
 3 Months Ended
Mar. 31, 2018
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Accounts receivable balances consisted of the following (in thousands):
 
March 31,
2018
 
December 31,
2017
Accounts receivable, gross
$
29,744

 
$
32,970

Less: allowance for doubtful accounts
(154
)
 
(150
)
Accounts receivable, net
$
29,590

 
$
32,820