Accounts Receivable, Net (Tables)

9 Months Ended

Sep. 30, 2016

Receivables [Abstract]

Accounts Receivable, Net

Accounts receivable, net balances at September 30, 2016 and December 31, 2015 were as follows (in thousands):

	September 30,			December 31,
	2016			2015
Trade accounts receivable	$	129,371		$	118,916
Unbilled revenue		78,964			47,351
Total accounts receivable		208,335			166,267
Allowance for doubtful accounts		(13,916	)		(12,659	)
Accounts receivable, net	$	194,419		$	153,608