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Derivative Financial Instruments (Fair Value) (Details) - Derivative designated as a cash flow hedge - Interest rate swap - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Notional Amounts $ 21,078,000 $ 21,969,000
Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value 13,000 16,000
Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value $ 0 $ 0