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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Accounts Receivable, Net of Allowances
Accounts receivable, net of allowances, consisted of the following (in thousands):
 
December 31,
 
2013
 
2012
Accounts receivable
$
83,266

 
$
95,515

Less: allowance for doubtful accounts and sales returns
(8,214
)
 
(9,595
)
 
$
75,052

 
$
85,920
Summary of Activity in Allowances for Doubtful Accounts, Returns and Discounts
The following is a summary of activity in allowances for doubtful accounts and sales returns for the three years ended December 31, 2013, 2012 and 2011 (in thousands):
 
Balance at
Beginning of
Period
 
Charges to
Revenue
 
Charges
(Credits) to
Expense
 
Additions to
(Deductions
from) Reserves
 
Balance at End
of Period
Year ended December 31,
 
 
 
 
 
 
 
 
 
2013
$
9,595

 
$
537

 
$
423

 
$
(2,341
)
 
$
8,214

2012
$
8,252

 
$
3,141

 
$
461

 
$
(2,259
)
 
$
9,595

2011
$
5,897

 
$
2,620

 
$
615

 
$
(880
)
 
$
8,252