Unbilled Receivables (Tables)

3 Months Ended

Mar. 31, 2019

Contractors [Abstract]

Schedule of Unbilled Receivables

Unbilled receivables consisted of the following:

	March 31, 2019			December 31, 2018
Unbilled revenue	$	30,497		$	27,908
Advances and progress billings	(23,130		)	(21,332		)
Net unbilled receivables	$	7,367		$	6,576