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Unbilled Receivables (Tables)
 9 Months Ended
Sep. 30, 2018
Contractors [Abstract]  
Schedule of Unbilled Receivables
Unbilled receivables consisted of the following:
 
September 30, 2018
 
December 31, 2017
Unbilled revenue
$
27,536

 
$
21,845

Advances and progress billings
(19,972
)
 
(16,605
)
Net unbilled receivables
$
7,564

 
$
5,240