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Accounts Receivable, net
3 Months Ended
Mar. 31, 2018
Receivables [Abstract]  
Accounts Receivable, net
Accounts Receivable, net

Accounts receivable at March 31, 2018 and December 31, 2017 were as follows (in thousands):
 
March 31,
 
December 31,
 
2018
 
2017
Trade accounts receivable, net of allowance of $4,972 and $4,777, respectively
$
88,993

 
$
83,482

Unbilled revenue
25,470

 
25,670

Taxes receivable
11,008

 
11,305

Affiliated (1)
549

 
716

Other receivables
6,243

 
6,037

Total accounts receivable, net
$
132,263

 
$
127,210

 
 
 

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