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Income Taxes (Schedule of Income Tax Expense Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Tax at Statutory Rate	$ 11,868	$ 12,007	$ 10,703
Tax Effect of:
Utility Plant Related	(1,016)	(1,059)	(920)
State Income Taxes - Net	895	770	745
Tax Act	(610)
Employee Benefits	(43)	(5)	7
Other	6	22	16
Total Income Tax Expense	$ 11,100	$ 11,735	$ 10,551

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible employee benefit costs.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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