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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2013
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,:
 
  
  
  
 
2013
 
$
14,074
  
$
693
  
$
(2,829
)
 
$
11,938
 
2012
  
4,080
   
10,523
   
(529
)
  
14,074
 
2011
  
1,322
   
2,766
   
(8
)
  
4,080