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Trade Accounts Receivable, Net
9 Months Ended
Sep. 30, 2014
Receivables [Abstract]  
Trade Accounts Receivable, Net
Trade Accounts Receivable, Net
 
Trade accounts receivable consisted of the following: 
 
At September 30,
 
At December 31,
(in thousands)
2014
 
2013
 
2013
Trade accounts receivable
$
131,323

 
$
122,328

 
$
92,413

Allowance for doubtful accounts
(836
)
 
(1,384
)
 
(945
)
Allowance for sales discounts and returns
(2,992
)
 
(2,049
)
 
(1,451
)
 
$
127,495

 
$
118,895

 
$
90,017