Oil and Natural Gas Capitalized Costs (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Proved properties:
Leasehold acquisition	$ 5,505,535	$ 4,695,704
Development	1,066,039	840,175
Unproved properties	169,093	128,624
Oil and natural gas properties (successful efforts method)	6,740,667	5,664,503
Less accumulated depletion and amortization	(855,314)	(719,035)
Oil and natural gas properties, successful efforts method, net	$ 5,885,353	$ 4,945,468

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The capitalized costs for development of oil and natural gas properties with proved reserves under the successful effort method.

+ Details

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- Definition

The capitalized costs for leasehold acquisitions of oil and natural gas properties with proved reserves under the successful effort method.

+ Details

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- Definition

Accumulated depreciation, depletion and amortization of oil and gas property carried under the successful effort method.

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- Definition

Oil and Gas properties, gross, carried under the successful effort method.

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Oil and Gas properties net of accumulated DD&A, Impairment and Abandonment, carried under the successful effort method.

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- Definition

Oil and Gas properties with unproved reserves under the successful effort method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 19
-Paragraph 11
-Subparagraph a

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 19
-Paragraph 147, 148

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 19
-Paragraph 59N

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