Summary of Significant Accounting Policies (Advances for Construction and Contributions in Aid of Construction) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	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