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Accounts Receivable, net (Tables)
3 Months Ended
Mar. 31, 2016
Receivables [Abstract]  
Schedule of Accounts Receivable
Accounts receivable at March 31, 2016 and December 31, 2015 were as follows (in thousands):
 
March 31,
 
December 31,
 
2016
 
2015
Trade accounts receivable, net of allowance
 
 
 
of $2,831 and $2,528, respectively
$
142,966

 
$
166,256

Unbilled revenue
34,543

 
40,033

Taxes receivable
34,871

 
34,163

Affiliated (1)
770

 
3,966

Other receivables
1,312

 
1,773

Total accounts receivable
$
214,462

 
$
246,191

 
 
 

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