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Income Taxes (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |
U.S. federal statutory tax rate (as a percent) | 21.00% | 35.00% | 21.00% | 35.00% |
Effective Income Tax Rate Reconciliation, Percent | 28.80% | 67.30% | 28.80% | 47.20% |
Unrecognized Tax Benefit Including Tax Interest Accrued | $ 0.4 |  | $ 0.4 |  | $ 0.8
Tax Benefit Stock Compensation [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Current Federal Tax Expense (Benefit) |  |  | $ 1.0 |  |

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