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Unbilled Receivables
 6 Months Ended
Jul. 02, 2017
Contractors [Abstract]  
Unbilled Receivables
UNBILLED RECEIVABLES
Unbilled receivables represent revenue recognized on long-term contracts less associated advances and progress billings. These amounts will be billed in accordance with the agreed-upon contractual terms or upon shipment of products or rendering of services. Unbilled receivables consisted of the following:
 
July 2, 2017
 
December 31, 2016
Unbilled revenue
$
27,400

 
$
25,543

Advances and progress billings
(22,355
)
 
(21,331
)
Net unbilled receivables
$
5,045

 
$
4,212


The increase in unbilled receivables during the six-month period ended July 2, 2017, is due in part to the timing of billings on a large contract for a Middle Eastern customer in our Combat Systems group.