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Income Taxes (Narrative) (Details) - USD ($) $ in Millions |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 22, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Doubling bonus depreciation | 100.00% |  |
Doubling bonus depreciation, period | 5 years |  |
Additional depreciation |  |  | $ 5.0
Income tax benefit |  | $ 0.6 |
Expected effective income tax rate for the year |  | 26.00% |

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