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Income Taxes (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule Of Effective Income Taxes Rate Reconciliation [Line Items] |  |  |
Tax expense at U.S. statutory rates | $ 5,716 | $ 7,665 | $ 5,401
State tax expense (benefit), net of federal benefit | (769) | 926 | 760
Other, net | 633 | 282 | 411
Federal tax reform - deferred tax rate change | (11,500) | 0 | 0
Total Income Tax Provision | $ (5,920) | $ 8,873 | $ 6,572

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