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Accounts Receivable, net
12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Accounts Receivable, net
Accounts Receivable, net

Accounts receivable at December 31, 2017 and 2016 were as follows (in thousands):
 
December 31,
 
2017
 
2016
Trade accounts receivable, net of allowance of $4,777 and $14,337, respectively
$
83,482

 
$
89,096

Unbilled receivables
25,670

 
30,882

Taxes receivable
11,305

 
42,870

Affiliated (1)
716

 
717

Other receivables
6,037

 
3,852

Total accounts receivable, net
$
127,210

 
$
167,417

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