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Income Taxes (Schedule of Net Deferred Tax Liability) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Utility Plant Related | $ 69,019 | $ 63,281
Customer Advances | (3,430) | (3,510)
Employee Benefits | 6,904 | 5,796
Investment Tax Credits (ITC) | 753 | 832
Net Operating Loss Carryforwards |  | 2,311
Other | (421) | (176)
Total Deferred Tax Liability and ITC | $ 72,825 | $ 68,534

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