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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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