Accounts Receivable, Net (Tables)

6 Months Ended

Jun. 30, 2015

Receivables [Abstract]

Accounts Receivable, Net

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

	June 30,			December 31,
	2015			2014
Trade accounts receivable	$	127,954		$	107,174
Unbilled revenue		61,260			47,789
Total accounts receivable		189,214			154,963
Allowance for doubtful accounts		(11,986	)		(11,915	)
Accounts receivable, net	$	177,228		$	143,048