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Unbilled Receivables
 6 Months Ended
Jul. 01, 2018
Contractors [Abstract]  
Unbilled Receivables
UNBILLED RECEIVABLES
Unbilled receivables represent revenue recognized on long-term contracts (contract costs and estimated profits) less associated advances and progress billings. These amounts will be billed in accordance with the agreed-upon contractual terms or upon achievement of contractual milestones. Unbilled receivables consisted of the following:
 
July 1, 2018
 
December 31, 2017
Unbilled revenue
$
24,610

 
$
21,845

Advances and progress billings
(17,485
)
 
(16,605
)
Net unbilled receivables
$
7,125

 
$
5,240


Excluding the acquisition of CSRA, the increase in net unbilled receivables during the six-month period ended July 1, 2018, was due primarily to the timing of billings on large international vehicle contracts in our Combat Systems segment.