The amount of any cash flow hedging swap contracts outstanding as of the given date.

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- Definition

The effective portion of gains and losses on natural gas hedge contracts designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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- Definition

The effective portion of gains and losses on oil hedge contracts designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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The amount of net gains and losses recognized in income during the period on natural gas hedge contracts designated and qualifying as hedging instruments in cash flow hedges.

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The amount of net gains and losses recognized in income during the period on oil hedge contracts designated and qualifying as hedging instruments in cash flow hedges.

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- Definition

The portion of gains and losses (net) on natural gas hedge contracts designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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The portion of gains and losses (net) on oil hedge contracts designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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- Definition

The amount of proved reserves sold to a third-party in a single transaction.

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

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The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 35

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 17

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 29

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 15

-Article 7

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 38

-Subparagraph b(3)

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 30

-Paragraph 11, 20, 24

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Hedge Contracts (Details) (USD $)	3 Months Ended			9 Months Ended
Hedge Contracts (Details) (USD $)	Sep. 30, 2011	Jun. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	May 31, 2011
Hedge Contracts
Percentage of proved reserves sold in a single transaction						79.00%
Cash paid for liquidation of derivative contract		$ 14,200,000
Cash flow hedging swap contracts outstanding	0.00
Derivative Swap Contracts, Oil
Amount of pretax gain reclassified from accumulated other comprehensive income into product sales revenue (effective portion)			6,753,000	1,177,000	16,821,000
Amount of pretax gain (loss) from change in derivative fair value recognized in other comprehensive income			(4,872,000)	(7,854,000)	4,577,000
Amount of pretax gain (loss) recognized in other income (expense) (ineffective portion)			0	(13,947,000)	125,000
Derivative Swap Contracts, Natural Gas
Amount of pretax gain reclassified from accumulated other comprehensive income into product sales revenue (effective portion)			6,384,000	0	18,609,000
Amount of pretax gain (loss) from change in derivative fair value recognized in other comprehensive income			1,938,000	0	9,225,000
Amount of pretax gain (loss) recognized in other income (expense) (ineffective portion)			(108,000)	0	107,000
Derivative Swap Contracts, Total
Amount of pretax gain reclassified from accumulated other comprehensive income into product sales revenue (effective portion)			13,137,000	1,177,000	35,430,000
Amount of pretax gain (loss) from change in derivative fair value recognized in other comprehensive income			(2,934,000)	(7,854,000)	13,802,000
Amount of pretax gain (loss) recognized in other income (expense) (ineffective portion)			$ (108,000)	$ (13,947,000)	$ 232,000