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Summary of Significant Accounting Policies, Restricted Cash and Cash Equivalents (Details) (USD $)	1 Months Ended	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Restricted Cash and Cash Equivalents Abstract]
Restricted cash and cash equivalents	$ 9,066,000	$ 9,066,000	$ 14,221,000
Diversified Lands Mitigation Escrow Agreement [Member]
Restricted Cash and Cash Equivalents Abstract]
Restricted cash and cash equivalents	97,000	97,000	97,000
Katrina/Rita Bond Payments [Member]
Restricted Cash and Cash Equivalents Abstract]
Restricted cash and cash equivalents	3,278,000	3,278,000	8,781,000
Collection net of operating expenses		4,900,000
Bond principal payments	(7,100,000)
Bond interest payments	(3,300,000)
Future Storm Restoration Costs [Member]
Restricted Cash and Cash Equivalents Abstract]
Restricted cash and cash equivalents	$ 5,691,000	$ 5,691,000	$ 5,343,000

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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