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Income Taxes (Schedule of Income Tax Expense Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Tax at Statutory Rate	$ 7,009	$ 11,868	$ 12,007
Tax Effect of:
Utility Plant Related	422	(1,016)	(1,059)
Tangible Property Repairs	(7,763)
State Income Taxes - Net	1,207	895	770
Tax Act		(610)
Other	49	(37)	17
Total Income Tax Expense	$ 924	$ 11,100	$ 11,735

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to tangible property repairs.

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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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