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Unbilled Receivables (Tables)
 12 Months Ended
Dec. 31, 2020
Contractors [Abstract]  
Schedule of Unbilled Receivables Unbilled receivables consisted of the following:
December 3120202019
Unbilled revenue$36,657 $33,481 
Advances and progress billings(28,633)(25,624)
Net unbilled receivables$8,024 $7,857