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Accounts Receivable, net
3 Months Ended
Mar. 31, 2019
Receivables [Abstract]  
Accounts Receivable, net
Accounts Receivable, net

Accounts receivable at March 31, 2019 and December 31, 2018 were as follows (in thousands):
 
March 31,
 
December 31,
 
2019
 
2018
Trade accounts receivable, net of allowance of $3,939 and $3,925, respectively
$
142,609

 
$
114,630

Unbilled revenue
43,257

 
54,591

Taxes receivable
16,423

 
15,762

Affiliated (1)
551

 
549

Other receivables
2,461

 
3,882

Total accounts receivable, net
$
205,301

 
$
189,414

 
 
 

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