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Accounts Receivable, net
9 Months Ended
Sep. 30, 2015
Receivables [Abstract]  
Accounts Receivable, net
Accounts Receivable, net

Accounts receivable at September 30, 2015 and December 31, 2014 were as follows (in thousands):
 
September 30,
 
December 31,
 
2015
 
2014
Trade accounts receivable, net of allowance
 
 
 
of $2,217 and $2,477, respectively
$
224,549

 
$
291,140

Unbilled revenue
50,002

 
62,993

Taxes receivable
43,105

 
32,056

Affiliated (1)
3,824

 
3,370

Other receivables
3,047

 
1,418

Total accounts receivable
$
324,527

 
$
390,977

 
 
 

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