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Accounts Receivable, net (Tables)
6 Months Ended
Jun. 30, 2018
Receivables [Abstract]  
Schedule of Accounts Receivable
Accounts receivable at June 30, 2018 and December 31, 2017 were as follows (in thousands):
 
June 30,
 
December 31,
 
2018
 
2017
Trade accounts receivable, net of allowance of $4,050 and $4,777, respectively
$
92,722

 
$
83,482

Unbilled revenue
38,996

 
25,670

Taxes receivable
9,553

 
11,305

Affiliated (1)
549

 
716

Other receivables
5,822

 
6,037

Total accounts receivable, net
$
147,642

 
$
127,210

 
 
 

(1) 
Amounts represent expenditures on behalf of non-consolidated affiliates.