Accounts Receivable

9 Months Ended

Sep. 30, 2016

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, 2016 and December 31, 2015 (in thousands):

	September 30, 2016			December 31, 2015
Trade accounts receivable	$	255,236		$	262,885
Unbilled accounts receivable	111,550			124,878
Gross accounts receivable	366,786			387,763
Allowance for doubtful accounts	(1,127		)	(906		)
Reserve for cash-basis customers	(7,662		)	(6,458		)
Total accounts receivable reserves	(8,789		)	(7,364		)
Accounts receivable, net	$	357,997		$	380,399