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Accounts Receivable
 6 Months Ended
Jun. 30, 2015
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
Accounts receivable consist of the following at June 30, 2015 and December 31, 2014:
(in thousands)
 
June 30, 
 2015
 
December 31, 
 2014
Trade receivables
 
$
137,389

 
$
118,531

Allowance for doubtful accounts
 
(2,290
)
 
(2,101
)
Allowance for sales returns and discounts
 
(2,195
)
 
(1,982
)
 
 
$
132,904

 
$
114,448