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Summary of Significant Accounting Policies, Restricted Cash (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Restricted Cash [Abstract]
Restricted cash	$ 30,580,000	$ 35,828,000
Diversified Lands Mitigation Escrow Agreement [Member]
Restricted Cash [Abstract]
Restricted cash	97,000	97,000
Katrina/Rita Bond Payments [Member]
Restricted Cash [Abstract]
Restricted cash	3,320,000	8,761,000
Collection net of operating expenses	4,800,000
Bond principal payments	6,700,000
Bond interest payments	3,600,000
Future Storm Restoration Costs [Member]
Restricted Cash [Abstract]
Restricted cash	25,450,000	24,876,000
Renewable Energy Grant [Member]
Restricted Cash [Abstract]
Restricted cash	0	381,000
Nox Allowance Escrow [Member]
Restricted Cash [Abstract]
Restricted cash	$ 1,713,000	$ 1,713,000

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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