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Fair Value Measurements (Reconciliation Of Changes In Fair Value Of Level 3 Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Fair Value Measurements [Abstract]
Balance as of January 1	$ (5,050)		$ (10,486)
Included in earnings			(31,666)
Included in other comprehensive income
Settlements			512
Transfers in and out of Level 3	5,050	[1]		[1]
Balance as of March 31			(41,640)
Change in unrealized losses included in earnings relating to derivatives still held at March 31			$ (31,154)
[1] During the first quarter of 2012, the inputs used to value the Company's commodity derivative instruments were directly or indirectly observable and those contracts were transferred to Level 2.

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Amount of unrealized gains and losses (net), included in the income statement for the period, from certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments) and which the entity has or had based its calculation of fair market value on unobservable inputs (Level 3).

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This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

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This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity).

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Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

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This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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