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Unbilled Receivables | 6 Months Ended
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Jun. 30, 2019
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. Unbilled receivables consisted of the following:
| June 30, 2019 |  | December 31, 2018
Unbilled revenue | $ | 31,643 |  |  | $ | 27,908 |
Advances and progress billings | (24,089 | ) |  | (21,332 | )
Net unbilled receivables | $ | 7,554 |  |  | $ | 6,576 |
The increase in net unbilled receivables during the six-month period ended June 30, 2019, was due primarily to an international wheeled armored vehicle contract in our Combat Systems segment. At June 30, 2019, the net unbilled receivable related to this contract was $2.4 billion. Our contract is with the Canadian government, who is selling the vehicles to an international customer. We have experienced delays in payment under the contract. We continue to meet our obligations under the contract and are entitled to payment for work performed. Therefore, we expect to collect the full amount currently outstanding.

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