Accounts Receivable, net (Tables)

6 Months Ended

Jun. 30, 2015

Receivables [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

Accounts receivable at June 30, 2015 and December 31, 2014 were as follows (in thousands):

	June 30,		December 31,
	2015		2014
Trade accounts receivable, net of allowance
of $2,680 and $2,477, respectively	$	219,279	$	291,140
Unbilled revenue	60,719		62,993
Taxes receivable	39,674		32,056
Affiliated (1)	3,365		3,370
Other receivables	1,654		1,418
Total accounts receivable	$	324,691	$	390,977

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