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Accounts Receivable Accounts Receivable
 12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Accounts receivable
Accounts Receivable

Accounts receivable consist of the following at December 31, 2014 and 2013:
(in thousands)
 
2014
 
2013
Trade receivables
 
$
118,531

 
$
115,876

Allowance for doubtful accounts
 
(2,101
)
 
(2,707
)
Allowance for sales returns and discounts
 
(1,982
)
 
(1,884
)
 
 
$
114,448

 
$
111,285



The following table shows the changes in our allowance for doubtful accounts:
(in thousands)
 
2014
 
2013
 
2012
Balance at January 1
 
$
2,707

 
$
3,095

 
$
2,669

Additions charged to expense
 
523

 
1,051

 
2,333

Deductions (write-offs)
 
(1,129
)
 
(1,439
)
 
(1,907
)
Balance at December 31
 
$
2,101

 
$
2,707

 
$
3,095



Recoveries of amounts previously written off were $2.1 million, $1.8 million and $3.4 million for the years ended December 31, 2014, 2013 and 2012, respectively.