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Unbilled Receivables (Tables)
 12 Months Ended
Dec. 31, 2019
Contractors [Abstract]  
Schedule of Unbilled Receivables Unbilled receivables consisted of the following:
December 31
2019
 
2018
Unbilled revenue
$
33,481

 
$
27,908

Advances and progress billings
(25,624
)
 
(21,332
)
Net unbilled receivables
$
7,857

 
$
6,576