Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells.

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The cash outflow for exploration and development of oil and gas properties. It includes cash payments related to development of oil and gas wells drilled at previously untested geologic structures (to determine the presence of oil or gas) and wells drilled at sites where the presence of oil or gas has already been established (to extract the oil or gas).

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Organization and Business Exploration Expenses (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	1 Months Ended	9 Months Ended	15 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Ship Shoal 134 and South Timbalier 75 [Member]	Dec. 31, 2012 Ship Shoal 134 and South Timbalier 75 [Member]	Oct. 31, 2012 Tuscaloosa Marine Shale [Member]	Dec. 31, 2012 Tuscaloosa Marine Shale [Member] acre	Jun. 30, 2012 Kaybob Duvernay [Member] Alta Energy [Member]	Dec. 31, 2012 Goodrich [Member]
Organization and Business [Line Items]
Exploration Expense	$ 6,629,000	$ 33,000	$ 51,614,000	$ 56,000	$ 6,262,000	$ 50,000,000
Payments to Explore and Develop Oil and Gas Properties			68,623,000	13,027,000			4,300,000	9,000,000	13,100,000
Gas and Oil Area, Undeveloped, Net								24,000
Equity Method Investments	33,800,000		33,800,000
Impairment of Ongoing Project			$ 14,100,000
Working Interests in Oil and Gas Properties										25.00%