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Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Income Tax Disclosure [Abstract] |  |
Utility Plant Related | $ 41,912 | $ 39,020
Customer Advances | (3,598) | (3,673)
Employee Benefits | 1,121 | 6,523
Investment Tax Credits (ITC) | 989 | 1,068
Other | (325) | (94)
Total Deferred Tax Liability and ITC | $ 40,099 | $ 42,844

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