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Trade Accounts Receivable, Net
6 Months Ended
Jun. 30, 2015
Receivables [Abstract]  
Trade Accounts Receivable, Net
Trade Accounts Receivable, Net
 
Trade accounts receivable consisted of the following: 
 
At June 30,
 
At December 31,
(in thousands)
2015
 
2014
 
2014
Trade accounts receivable
$
144,935

 
$
141,565

 
$
95,033

Allowance for doubtful accounts
(829
)
 
(936
)
 
(929
)
Allowance for sales discounts and returns
(3,161
)
 
(2,826
)
 
(2,089
)
 
$
140,945

 
$
137,803

 
$
92,015