Accounts Receivable, Net (Tables)

3 Months Ended

Mar. 31, 2017

Receivables [Abstract]

Accounts Receivable, Net

Accounts receivable, net balances at March 31, 2017 and December 31, 2016 were as follows (in thousands):

	March 31,			December 31,
	2017			2016
Trade accounts receivable	$	140,290		$	132,880
Unbilled revenue		93,843			55,982
Total accounts receivable		234,133			188,862
Allowance for doubtful accounts		(13,274	)		(13,508	)
Accounts receivable, net	$	220,859		$	175,354