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Accounts Receivable, net (Tables)
 3 Months Ended
Mar. 31, 2013
Receivables [Abstract]  
Accounts receivable, net
Accounts receivable, net, consists of the following:
 
March 31,
2013
 
December 31,
2012
Gross accounts receivable
$
121,783

 
$
117,853

Allowance for doubtful accounts
(13,908
)
 
(11,711
)
Total accounts receivable, net
$
107,875

 
$
106,142
Receivables from distributors
Receivables from distributors consist of the following:
 
March 31,
2013
 
December 31,
2012
Billed
$
56,996

  
$
53,057

Unbilled
45,766

  
51,368

Total
$
102,762

  
$
104,425