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Income Taxes (Schedule of Net Deferred Tax Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Utility Plant Related	$ 44,777	$ 41,259
Customer Advances	(3,702)	(3,749)
Employee Benefits	5,490	4,903
Investment Tax Credits (ITC)	596	675
Other	109	72
Total Deferred Tax Liability and ITC	$ 47,270	$ 43,160

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences derived customer advances.

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Amount before allocation of valuation allowances of deferred tax liabilities attributable to deductible investment tax credits.

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Amount of deferred tax liability attributable to taxable temporary differences of utility plant related.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.

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