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Income Taxes (Details 2) - USD ($)
$ in Thousands
12 Months Ended
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