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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2012
Accounts Receivable [Abstract]  
Changes in Allowance for Doubtful Accounts and Sales Returns
The following table shows the changes in our allowance for doubtful accounts and sales returns.
 
 
 
Balance at Beginning of Period
 
 
Net Additions Charged to Revenue and Expenses
 
 
Deductions
 
 
Balance at End of Period
 
For year ended December 31,:
 
 
 
 
 
 
 
 
 
 
 
 
2012
 
$
4,080
 
 
 
10,523
 
 
 
(529
)
 
$
14,074
 
2011
 
$
1,322
 
 
 
2,766
 
 
 
(8
)
 
$
4,080
 
2010
 
$
1,287
 
 
 
593
 
 
 
(558
)
 
$
1,322