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Unbilled Receivables (Tables)
 9 Months Ended
Sep. 29, 2019
Contractors [Abstract]  
Schedule of Unbilled Receivables Unbilled receivables consisted of the following:
 
September 29, 2019
 
December 31, 2018
Unbilled revenue
$
33,170

 
$
27,908

Advances and progress billings
(25,093
)
 
(21,332
)
Net unbilled receivables
$
8,077


$
6,576