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Accounts Receivable, net (Tables)
12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Schedule of Accounts Receivable
Accounts receivable at December 31, 2018 and 2017 were as follows (in thousands):
 
December 31,
 
2018
 
2017
Trade accounts receivable, net of allowance of $3,925 and $4,777, respectively
$
114,630

 
$
83,482

Unbilled receivables
54,591

 
25,670

Taxes receivable
15,762

 
11,305

Affiliated (1)
549

 
716

Other receivables
3,882

 
6,037

Total accounts receivable, net
$
189,414

 
$
127,210

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