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Summary of Significant Accounting Policies (Advances for Construction and Contributions in Aid of Construction) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
Property, Plant and Equipment [Line Items] |
Refund period for advances for construction received after 1981 | 40 years
Estimated Refunds of Advances for Construction [Abstract] |
2013 | $ 2,402
2014 | 2,403
2015 | 2,402
2016 | 2,402
2017 | 2,402
Thereafter | $ 58,032
Amortization period for taxes paid relating to advances and contributions | 40 years

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