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Business Segments and Customer Information - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable operating segments | segment |  | 3 |  |
Gain on sale of contract | $ 1,700 | $ 1,700 | $ 0 | $ 0
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gain resulting from the combined effect of the Anchorage Lawsuit and Maritime Administration settlements |  |  |  | 1,400
Corporate | Heritage Litigation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Settlement amount |  |  |  | $ 3,300
Unspecified Customer One | IT Contract | Federal Services Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gain on sale of contract | $ 1,700 |  |  |

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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Gain (Loss) on Sale of Contract + References No definition available. + Details
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- Details
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- Details
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- Details
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