Accounts Receivable (Tables)

6 Months Ended

Jun. 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 June 30, 2014 and December 31, 2013 (in thousands):

	June 30, 2014			December 31, 2013
Trade accounts receivable	$	239,581		$	175,391
Unbilled accounts receivable	92,422			100,300
Gross accounts receivable	332,003			275,691
Allowance for doubtful accounts	(774		)	(708		)
Reserve for cash-basis customers	(5,844		)	(2,995		)
Total accounts receivable reserves	(6,618		)	(3,703		)
Accounts receivable, net	$	325,385		$	271,988