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Unbilled Receivables (Tables)
 6 Months Ended
Jun. 30, 2019
Contractors [Abstract]  
Schedule of Unbilled Receivables Unbilled receivables consisted of the following:
 
June 30, 2019
 
December 31, 2018
Unbilled revenue
$
31,643

 
$
27,908

Advances and progress billings
(24,089
)
 
(21,332
)
Net unbilled receivables
$
7,554


$
6,576