Business Segment Information - Additional Information (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
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Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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Segment Reporting Information [Line Items] | |||
Unallocated corporate expense segment | $ (30,415) | $ (27,195) | $ (32,225) |
Customer Who Declared Bankruptcy | |||
Segment Reporting Information [Line Items] | |||
Unallocated corporate expense segment | $ (2,870) | ||
Various Governments | Sales Revenue, Net | Customer Concentration Risk | |||
Segment Reporting Information [Line Items] | |||
Concentration risk percentage | 77.00% | 77.00% | 77.00% |
U.S. Federal Government | Sales Revenue, Net | Customer Concentration Risk | |||
Segment Reporting Information [Line Items] | |||
Concentration risk percentage | 31.30% | 32.00% | 27.30% |
Canada | Operating Segments | |||
Segment Reporting Information [Line Items] | |||
Interest and debt expense | $ 1,934 |
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- Definition Unallocated Corporate Expense Segment No definition available.
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Interest and debt related expenses associated with nonoperating financing activities of the entity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. No definition available.
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