Business Segment Information - Narrative (Details) - USD ($) |
3 Months Ended | 6 Months Ended | 12 Months Ended |
|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2018 |
Dec. 31, 2017 |
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| Segment Reporting Information [Line Items] | |||
| Unallocated corporate expense | $ 0 | $ 0 | |
| Customer Who Declared Bankruptcy | |||
| Segment Reporting Information [Line Items] | |||
| Unallocated corporate expense | $ 1,001,000 |
| X | ||||||||||
- Definition Unallocated Corporate Expense Segment No definition available.
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| X | ||||||||||
- 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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| X | ||||||||||
- Details
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