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Accounts Receivable Accounts Receivable (Tables)
 6 Months Ended
Jun. 30, 2014
Receivables [Abstract]  
Schedule of accounts receivable
Accounts receivable consist of the following at June 30, 2014 and December 31, 2013:
(in thousands)
 
June 30, 
 2014
 
December 31, 
 2013
Trade receivables
 
$
135,774

 
$
115,876

Allowance for doubtful accounts
 
(2,433
)
 
(2,707
)
Allowance for sales returns and discounts
 
(2,342
)
 
(1,884
)
 
 
$
130,999

 
$
111,285