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Unbilled Receivables (Tables)
 9 Months Ended
Sep. 27, 2020
Contractors [Abstract]  
Schedule of Unbilled Receivables Unbilled receivables consisted of the following:
 
September 27, 2020
 
December 31, 2019
Unbilled revenue
$
33,244

 
$
33,481

Advances and progress billings
(25,101
)
 
(25,624
)
Net unbilled receivables
$
8,143


$
7,857