Accounts Receivable, net (Tables)

6 Months Ended

Jun. 30, 2017

Receivables [Abstract]

Schedule of Accounts Receivable

Accounts receivable at June 30, 2017 and December 31, 2016 were as follows (in thousands):

	June 30,		December 31,
	2017		2016
Trade accounts receivable, net of allowance of $14,064 and $14,337, respectively	$	108,753	$	89,096
Unbilled revenue	24,829		30,882
Taxes receivable	29,614		42,870
Affiliated (1)	838		717
Other receivables	3,931		3,852
Total accounts receivable	$	167,965	$	167,417

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