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Accounts Receivable, net (Tables)
9 Months Ended
Sep. 30, 2019
Receivables [Abstract]  
Schedule of Accounts Receivable

Accounts receivable at September 30, 2019 and December 31, 2018 were as follows (in thousands):
 
September 30,
 
December 31,
 
2019
 
2018
Trade accounts receivable, net of allowance of $3,816 and $3,925, respectively
$
122,684

 
$
114,630

Unbilled receivables
34,066

 
54,591

Taxes receivable
18,649

 
15,762

Affiliated (1)
549

 
549

Other receivables
3,221

 
3,882

Total accounts receivable, net
$
179,169

 
$
189,414

 
 
 

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