Intangible Asset (Details) (USD $)	12 Months Ended						12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2008 Right to bill and collect storm recovery charges from customers and financing costs [Member]	Dec. 31, 2013 Right to bill and collect storm recovery charges from customers and financing costs [Member]	Dec. 31, 2012 Right to bill and collect storm recovery charges from customers and financing costs [Member]	Dec. 31, 2008 Right to bill and collect storm recovery charges from customers [Member]	Dec. 31, 2008 Financing costs [Member]	Dec. 31, 2008 Minimum [Member] Right to bill and collect storm recovery charges from customers and financing costs [Member]	Dec. 31, 2008 Maximum [Member] Right to bill and collect storm recovery charges from customers and financing costs [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible asset				$ 177,500,000			$ 176,000,000	$ 1,500,000
Intangible asset expected useful life, minimum (in years)									12 years	15 years
Acquired Finite-lived Intangible Asset, Residual Value							0
Amortization expense	14,500,000	13,100,000	11,800,000
Intangible asset, net [Abstract]
Gross carrying amount					177,537,000	177,537,000
Accumulated amortization					71,530,000	56,992,000
Intangible asset	106,007,000	120,545,000			106,007,000	120,545,000
Expected amortization expense
For the year ending December 31, 2014					14,931,000
For the year ending December 31, 2015					15,876,000
For the year ending December 31, 2016					16,864,000
For the year ending December 31, 2017					18,009,000
For the year ending December 31, 2018					19,312,000
After 2018					$ 21,015,000