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Unbilled Receivables (Tables)
 6 Months Ended
Jul. 04, 2021
Contractors [Abstract]  
Schedule of Unbilled Receivables Unbilled receivables consisted of the following:
July 4, 2021December 31, 2020
Unbilled revenue$37,015 $36,657 
Advances and progress billings(29,092)(28,633)
Net unbilled receivables$7,923 $8,024