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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]    
Provisional amount related to remeasurement of deferred tax balance $ 32,900,000  
Estimate for full expense on certain assets and executive compensation limitation 2,000,000  
Income taxes receivable 22,500,000 $ 2,400,000
Valuation allowance (557,000) $ (227,000)
Valuation allowance increase 300,000  
State operating loss carryforwards 2,400,000  
Unrecognized tax benefits 0  
State and Local Jurisdiction    
Operating Loss Carryforwards [Line Items]    
Valuation allowance, state net operating loss carryforwards 600,000  
State tax credit carryforward $ 1,000,000