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Accounts Receivable, Net (Tables)
 3 Months Ended
Mar. 31, 2015
Receivables [Abstract]  
Schedule of accounts receivable, net
Accounts receivable, net consists of the following:
 
March 31, 2015
 
December 31, 2014
Trade receivables
$
53,469

 
$
53,081

Unbilled revenue
5,882

 
4,036

Other receivables
2,003

 
1,581

 
61,354

 
58,698

Less: Allowance for doubtful accounts
(470
)
 
(464
)
Accounts receivable, net
$
60,884

 
$
58,234
Impact of operating income
Cumulative catch-up adjustments had the following impacts to operating income for the periods presented:
 
Three Months Ended March 31,
 
2015
2014
Favorable adjustments
$
412

$
271

Unfavorable adjustments
(36
)
(306
)
Net favorable (unfavorable) operating income adjustments
$
376

$
(35
)