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Trade Accounts Receivable, Net
 9 Months Ended
Sep. 30, 2015
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)
2015
 
2014
 
2014
Trade accounts receivable
$
136,748

 
$
131,323

 
$
95,033

Allowance for doubtful accounts
(919
)
 
(836
)
 
(929
)
Allowance for sales discounts and returns
(3,102
)
 
(2,992
)
 
(2,089
)
 
$
132,727

 
$
127,495

 
$
92,015