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Trade Accounts Receivable, Net (Tables)
 6 Months Ended
Jun. 30, 2014
Receivables [Abstract]  
Schedule of trade accounts receivable, net
Trade accounts receivable consisted of the following: 
 
At June 30,
 
At December 31,
(in thousands)
2014
 
2013
 
2013
Trade accounts receivable
$
141,565

 
$
130,612

 
$
92,413

Allowance for doubtful accounts
(936
)
 
(1,141
)
 
(945
)
Allowance for sales discounts and returns
(2,826
)
 
(2,583
)
 
(1,451
)
 
$
137,803

 
$
126,888

 
$
90,017