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Income Taxes (Schedule of Net Deferred Tax Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Utility Plant Related	$ 41,259	$ 69,019
Customer Advances	(3,749)	(3,430)
Employee Benefits	4,903	6,904
Investment Tax Credits (ITC)	675	753
Other	72	(421)
Total Deferred Tax Liability and ITC	$ 43,160	$ 72,825

X

- Definition

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

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- Definition

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

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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