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Trade Accounts Receivable, Net (Tables)
 3 Months Ended
Mar. 31, 2016
Receivables [Abstract]  
Schedule of trade accounts receivable, net
Trade accounts receivable consisted of the following: 
 
At March 31,
 
At December 31,
(in thousands)
2016
 
2015
 
2015
Trade accounts receivable
$
139,198

 
$
120,701

 
$
109,859

Allowance for doubtful accounts
(918
)
 
(765
)
 
(1,142
)
Allowance for sales discounts and returns
(3,157
)
 
(2,620
)
 
(2,706
)
 
$
135,123

 
$
117,316

 
$
106,011