Accounts Receivable

3 Months Ended

Mar. 31, 2015

Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]

Accounts Receivable

Accounts Receivable

Net accounts receivable consisted of the following as of March 31, 2015 and December 31, 2014 (in thousands):

	March 31, 2015			December 31, 2014
Trade accounts receivable	$	245,268		$	222,531
Unbilled accounts receivable	121,327			116,070
Gross accounts receivable	366,595			338,601
Allowance for doubtful accounts	(863		)	(1,033		)
Reserve for cash-basis customers	(9,103		)	(7,990		)
Total accounts receivable reserves	(9,966		)	(9,023		)
Accounts receivable, net	$	356,629		$	329,578