Accounts Receivable

9 Months Ended

Sep. 30, 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 September 30, 2018 and December 31, 2017 (in thousands):

	September 30, 2018			December 31, 2017
Trade accounts receivable	$	330,989		$	320,001
Unbilled accounts receivable	136,733			142,737
Gross accounts receivable	467,722			462,738
Allowance for doubtful accounts and other reserves	(1,358		)	(1,281		)
Accounts receivable, net	$	466,364		$	461,457