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Trade Accounts Receivable, net (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Schedule of trade accounts receivable, net Trade accounts receivable consisted of the following: 
 
December 31,
 (in thousands)
2018
 
2017
Trade accounts receivable
$
149,886

 
$
139,910

Allowance for doubtful accounts
(1,364
)
 
(996
)
Allowance for sales discounts
(2,470
)
 
(2,956
)
 
$
146,052

 
$
135,958