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Trade Accounts Receivable, net (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Schedule of trade accounts receivable, net
Trade accounts receivable consisted of the following:
 
 
December 31,
 (in thousands)
2017
 
2016
Trade accounts receivable
$
139,910

 
$
116,368

Allowance for doubtful accounts
(996
)
 
(895
)
Allowance for sales discounts
(2,956
)
 
(3,050
)
 
$
135,958

 
$
112,423