Accounts Receivable

3 Months Ended

Mar. 31, 2018

Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]

Accounts Receivable

Accounts Receivable

Net accounts receivable consisted of the following as of March 31, 2018 and December 31, 2017 (in thousands):

	March 31, 2018			December 31, 2017
Trade accounts receivable	$	345,112		$	320,001
Unbilled accounts receivable	140,816			142,737
Gross accounts receivable	485,928			462,738
Allowance for doubtful accounts and other reserves	(1,311		)	(1,281		)
Accounts receivable, net	$	484,617		$	461,457