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Accounts Receivable (Tables)
 3 Months Ended
Mar. 31, 2015
Receivables [Abstract]  
Schedule of accounts receivable
Accounts receivable consist of the following at March 31, 2015 and December 31, 2014:
(in thousands)
 
March 31, 
 2015
 
December 31, 
 2014
Trade receivables
 
$
125,444

 
$
118,531

Allowance for doubtful accounts
 
(2,085
)
 
(2,101
)
Allowance for sales returns and discounts
 
(2,237
)
 
(1,982
)
 
 
$
121,122

 
$
114,448