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Income Taxes (Schedule of Net Deferred Tax Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Utility Plant Related	$ 63,281	$ 43,996
Customer Advances	(3,510)	(3,570)
Employee Benefits	5,796	7,223
Investment Tax Credits (ITC)	832	$ 910
Net Operating Loss Carryforwards	2,311
Other	(176)	$ (343)
Total Deferred Tax Liability and ITC	$ 68,534	$ 48,216

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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 allowances of deferred tax asset attributable to deductible operating loss carryforwards.

+ References

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