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Allowance for Doubtful Accounts Receivable and Sales Returns (Tables)
 12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Activity in Allowance for Doubtful Accounts Receivable and Sales Returns
Activity in the allowance for doubtful accounts receivable (in thousands):
 
 
Years Ended December 31,
 
 
2013
 
2012
 
2011
Balance, beginning of year
 
$
1,010

 
$
1,445

 
$
1,529

Addition (reduction) to allowance
 
(2
)
 
76

 
693

Amounts written off
 
(83
)
 
(529
)
 
(742
)
Effects of foreign currency translation
 
41

 
18

 
(35
)
Balance, end of year
 
$
966

 
$
1,010

 
$
1,445

Activity in the allowance for sales returns (in thousands):
 
 
Years Ended December 31,
 
 
2013
 
2012
 
2011
Balance, beginning of year
 
$
653

 
$
668

 
$
1,039

Addition (reduction) to allowance
 
(64
)
 
153

 
939

Amounts written off
 
(21
)
 
(168
)
 
(1,311
)
Effects of foreign currency translation
 
1

 
—

 
1

Balance, end of year
 
$
569

 
$
653

 
$
668

Total, Allowance for Doubtful Accounts Receivable and Sales Returns
 
$
1,535

 
$
1,663

 
$
2,113