Accounts Receivable

6 Months Ended

Jun. 30, 2019

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

Accounts Receivable

Accounts Receivable

Net accounts receivable consisted of the following as of June 30, 2019 and December 31, 2018 (in thousands):

	June 30, 2019			December 31, 2018
Trade accounts receivable	$	378,469		$	337,445
Unbilled accounts receivable	146,525			143,978
Gross accounts receivable	524,994			481,423
Allowance for doubtful accounts and other reserves	(1,612		)	(1,534		)
Accounts receivable, net	$	523,382		$	479,889