Accounts Receivable, Net (Tables)

9 Months Ended

Sep. 30, 2015

Receivables [Abstract]

Accounts Receivable, Net

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

	September 30,			December 31,
	2015			2014
Trade accounts receivable	$	120,878		$	107,174
Unbilled revenue		67,719			47,789
Total accounts receivable		188,597			154,963
Allowance for doubtful accounts		(12,842	)		(11,915	)
Accounts receivable, net	$	175,755		$	143,048