Contract Receivables (Tables)

9 Months Ended

Sep. 30, 2017

Receivables [Abstract]

Summary of Contract Receivables

Contract receivables consisted of the following: 

	September 30, 2017			December 31, 2016
Billed	$	164,047		$	170,436
Unbilled		127,620			113,520
Allowance for doubtful accounts		(3,607	)		(2,591	)
Contract receivables, net	$	288,060		$	281,365