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Trade Accounts Receivable, net (Tables)
 12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Schedule of trade accounts receivable, net
Trade accounts receivable consisted of the following:
 
(in thousands)
 
December 31,
 
2014
 
2013
Trade accounts receivable
$
95,033

 
$
92,413

Allowance for doubtful accounts
(929
)
 
(945
)
Allowance for sales discounts
(2,089
)
 
(1,451
)
 
$
92,015

 
$
90,017