Accounts Receivable, net (Tables)

12 Months Ended

Dec. 31, 2014

Receivables [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

Accounts receivable at December 31, 2014 and 2013 were as follows (in thousands):

	December 31,
	2014		2013
Trade accounts receivable, net of allowance
of $2,477 and $13,614, respectively	$	291,140	$	232,409
Unbilled receivables	62,993		105,824
Taxes receivable	32,056		20,075
Affiliated (1)	3,370		3,921
Other receivables	1,418		2,588
Total accounts receivable	$	390,977	$	364,817

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