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Accounts Receivable, net
12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Accounts Receivable, net
Accounts Receivable, net

Accounts receivable at December 31, 2015 and 2014 were as follows (in thousands):
 
December 31,
 
2015
 
2014
Trade accounts receivable, net of allowance
 
 
 
of $2,528 and $2,477, respectively
$
166,256

 
$
291,140

Unbilled receivables
40,033

 
62,993

Taxes receivable
34,163

 
32,056

Affiliated (1)
3,966

 
3,370

Other receivables
1,773

 
1,418

Total accounts receivable
$
246,191

 
$
390,977

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