Accounts Receivable (Tables)

9 Months Ended

Sep. 30, 2014

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

Schedule of Accounts Receivable

Net accounts receivable consisted of the following as of September 30, 2014 and December 31, 2013 (in thousands):

	September 30, 2014			December 31, 2013
Trade accounts receivable	$	235,166		$	175,391
Unbilled accounts receivable	97,447			100,300
Gross accounts receivable	332,613			275,691
Allowance for doubtful accounts	(1,032		)	(708		)
Reserve for cash-basis customers	(4,834		)	(2,995		)
Total accounts receivable reserves	(5,866		)	(3,703		)
Accounts receivable, net	$	326,747		$	271,988