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Business Segments and Customer Information - Segment Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) segment | Jun. 30, 2018 USD ($)
Segment Reporting [Abstract] |  |  |  |
Number of reportable operating segments | segment |  |  | 3 |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 189,111 | $ 170,394 | $ 359,030 | $ 347,291
Operating income | 16,416 | 13,855 | 28,229 | 25,448
Supply Chain Management Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 53,805 | 54,263 | 105,509 | 110,127
Aviation Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 54,997 | 35,804 | 104,367 | 68,554
Federal Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 80,309 | 80,327 | 149,154 | 168,610
Operating Segments | Supply Chain Management Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 53,805 | 54,263 | 105,509 | 110,127
Operating income | 7,557 | 8,168 | 14,545 | 15,764
Operating Segments | Aviation Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 54,997 | 35,804 | 104,367 | 68,554
Operating income | 5,204 | 2,846 | 8,252 | 5,107
Operating Segments | Federal Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 80,309 | 80,327 | 149,154 | 168,610
Operating income | 5,059 | 3,606 | 8,444 | 6,084
Corporate, Non-Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | $ (1,404) | $ (765) | $ (3,012) | $ (1,507)

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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 The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + 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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