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Trade Accounts Receivable, Net (Tables)
 3 Months Ended
Mar. 31, 2015
Receivables [Abstract]  
Schedule of trade accounts receivable, net
Trade accounts receivable consisted of the following: 
 
At March 31,
 
At December 31,
(in thousands)
2015
 
2014
 
2014
Trade accounts receivable
$
120,701

 
$
117,728

 
$
95,033

Allowance for doubtful accounts
(765
)
 
(870
)
 
(929
)
Allowance for sales discounts and returns
(2,620
)
 
(2,699
)
 
(2,089
)
 
$
117,316

 
$
114,159

 
$
92,015