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Accounts Receivable, Net (Tables)
 6 Months Ended
Jun. 30, 2013
Accounts Receivable, Net [Abstract]  
Schedule of accounts receivable, net

     Accounts receivable, net consists of the following:

 
 
June 30,
 
 
December 31,
 
 
 
2013
 
 
2012
 
 
 
 
 
 
 
 
Trade receivables
 
$
58,261
 
 
$
50,876
 
Unbilled revenue
 
 
24,328
 
 
 
12,372
 
Other receivables
 
 
4,666
 
 
 
6,198
 
 
 
 
87,255
 
 
 
69,446
 
Less: Allowance for doubtful accounts
 
 
(231
)
 
 
(287
)
Accounts receivable, net
 
$
87,024
 
 
$
69,159