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Accounts Receivable, net (Tables)
9 Months Ended
Sep. 30, 2017
Receivables [Abstract]  
Schedule of Accounts Receivable
Accounts receivable at September 30, 2017 and December 31, 2016 were as follows (in thousands):
 
September 30,
 
December 31,
 
2017
 
2016
Trade accounts receivable, net of allowance of $13,907 and $14,337, respectively
$
96,034

 
$
89,096

Unbilled revenue
24,464

 
30,882

Taxes receivable
13,987

 
42,870

Affiliated (1)
895

 
717

Other receivables
5,526

 
3,852

Total accounts receivable
$
140,906

 
$
167,417

 
 
 

(1) 
Amounts represent expenditures on behalf of non-consolidated affiliates and receivables for aircraft charter income.