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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Components Of Income Tax Expense

			September 30,				September 30,
		Year Ended December 31,
		2011				2010
		(In thousands)
Current:
Federal		$	—			$	—
State			—				—
			—				—
Deferred:
Federal		$	42,809			$	38,153
State			3,980				4,809
			46,789				42,962
Total income tax expense		$	46,789			$	42,962

Schedule Of Effective Income Tax Rate Reconciliation

			September 30,				September 30,				September 30,				September 30,
		Year Ended December 31,
		2011								2010
		(%)				(In thousands)				(%)				(In thousands)
U.S. federal tax statutory rate			35.00	%		$	44,163				35.00	%		$	4,644
State income taxes, net of federal income tax benefit			2.38	%			3,004				2.75	%			364
Pass-through loss prior to IPO not subject to federal tax			—				—				3.85	%			511
Initial deferred tax expense			—				—				268.43	%			35,612
Non-deductible stock-based compensation			—				—				10.08	%			1,338
Non-deductible IPO costs and other			(0.30	%)			(378	)			3.72	%			493
Annual effective tax expense			37.08	%		$	46,789				323.83	%		$	42,962

Summary Of Deferred Tax Assets And Liabilities

			September 30,				September 30,
		Year Ended December 31,
		2011				2010
		(In thousands)
Deferred tax assets
Derivatives instruments		$	1,888			$	3,958
Net operating loss carryforward			13,110				43,455
Bonus and stock compensation			2,321				—
Total deferred tax assets			17,319				47,413
Deferred tax liabilities
Oil and natural gas properties			107,069				90,375
Total deferred tax liabilities			107,069				90,375
Total net deferred tax liability		$	89,750			$	42,962

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

+ References

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

-Topic 740

-SubTopic 10

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-Number

-Article

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-Name Accounting Standards Codification

-Paragraph 9

-Section 50

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

+ References

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

-Topic 740

-SubTopic 10

-Publisher FASB

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-Name Accounting Standards Codification

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

+ References

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

-Topic 740

-SubTopic 10

-Publisher FASB

-Number

-Article

-Subparagraph

-Name Accounting Standards Codification

-Paragraph 12

-Section 50

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