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Hedge Contracts (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2011	May 31, 2011
Notes (Details)
Liquidation of derivative contract	$ 14.2
Oil and gas properties sold in a single transaction representing a percentage of year-end proved reserves		7900.00%

This element represents the gains or losses, after tax, arising from an event or transaction that is both unusual in nature and infrequent in occurrence when considered in relation to the environment in which the entity operates and which has been recognized by the economic entity. This amount should be the same as the amount disclosed on the income statement before any deductions or allocation for any amounts attributable to noncontrolling interests, if any.

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