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Unbilled Receivables | 6 Months Ended
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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.

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- Definition The entire disclosure for long-term contracts or programs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -URI http://asc.fasb.org/subtopic&trid=2197326 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -URI http://asc.fasb.org/topic&trid=2145070 + Details
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