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Accounts Receivable, Net (Tables)
6 Months Ended
Jun. 30, 2017
Receivables [Abstract]  
Accounts Receivable, Net

Accounts receivable, net, at June 30, 2017 and December 31, 2016 were as follows (in thousands):

 

 

 

June 30,

 

 

December 31,

 

 

 

2017

 

 

2016

 

Trade accounts receivable

 

$

153,156

 

 

$

132,880

 

Unbilled revenue, at net realizable value

 

 

77,987

 

 

 

55,982

 

Total accounts receivable

 

 

231,143

 

 

 

188,862

 

Allowance for doubtful accounts

 

 

(12,826

)

 

 

(13,508

)

Accounts receivable, net

 

$

218,317

 

 

$

175,354