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Accounts Receivable, Net
6 Months Ended
Jun. 30, 2016
Receivables [Abstract]  
Accounts Receivable, Net

2.

Accounts Receivable, Net

Accounts receivable, net balances at June 30, 2016 and December 31, 2015 were as follows (in thousands):

 

 

 

June 30,

 

 

December 31,

 

 

 

2016

 

 

2015

 

Trade accounts receivable

 

$

136,653

 

 

$

118,916

 

Unbilled revenue

 

 

70,190

 

 

 

47,351

 

Total accounts receivable

 

 

206,843

 

 

 

166,267

 

Allowance for doubtful accounts

 

 

(13,688

)

 

 

(12,659

)

Accounts receivable, net

 

$

193,155

 

 

$

153,608