Accounts Receivable, Net (Tables)

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Accounts Receivable, Net

Accounts receivable, net balances at March 31, 2018 and December 31, 2017 were as follows (in thousands):

	March 31,			December 31,
	2018			2017
Trade accounts receivable	$	173,434		$	139,730
Unbilled revenue		102,952			62,397
Total accounts receivable		276,386			202,127
Allowance for doubtful accounts		(15,050	)		(13,827	)
Accounts receivable, net	$	261,336		$	188,300