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Income Taxes (Narrative) (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Income Taxes [Abstract] |  |  |  |  |
Effective income tax rate | 30.00% | 37.90% | 31.20% | 37.60% |
Federal statutory income tax rate |  |  | 21.00% |  | 35.00%

X
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