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Accounts Receivable
 9 Months Ended
Sep. 30, 2015
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
Accounts receivable consist of the following at September 30, 2015 and December 31, 2014:
(in thousands)
 
September 30, 
 2015
 
December 31, 
 2014
Trade receivables
 
$
142,928

 
$
118,531

Allowance for doubtful accounts
 
(2,376
)
 
(2,101
)
Allowance for sales returns and discounts
 
(2,147
)
 
(1,982
)
 
 
$
138,405

 
$
114,448